Doctor of Engineering, Hokkaido University

地盤工学

Geomechanics

Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Geotechnical engineering

Bachelor's degree program, School of Engineering

Master's degree program, Graduate School of Engineering

Doctoral (PhD) degree program, Graduate School of Engineering

Nov. 2012, International conference on Ground Improvement and Ground Control (ICGI2012), Best Paper Award
Bearing capacity improvement of anisotropic sand ground and its evaluation
KAWAMURA Shima;MIURA Seiichi;YOKOHAMA Shoji

2006, 地盤工学研究発表会優秀論文発表者賞
Japan

Apr. 2002, 地盤工学会北海道支部, 平成13年度地盤工学会北海道支部賞
繰返し荷重下にある砂地盤の側方流動変形解析法
横濱 勝司

磁界を帯びた鉄製部材を挿入した砂地盤の支持力向上のメカニズム
横浜勝司
第16回地盤改良シンポジウム発表論文集, Oct. 2024, [Peer-reviewed], [Lead author]
Symposium

地盤温度の熱電変換手法と磁化した鉄製部材を用いた地盤補強法に関する実験的研究
横浜勝司
第15回環境地盤工学シンポジウム発表論文集, 15, 252, 257, Nov. 2023, [Peer-reviewed], [Lead author]
Symposium

磁力を帯びた補強部材の設置による砂地盤の支持力向上に関する実験的検討
横浜勝司
第15回地盤改良シンポジウム発表論文集, 15, 375, 378, Dec. 2022, [Peer-reviewed], [Lead author]
Symposium

EXPERIMENTAL STUDY ON GROUND STRENGTHENING AND ELECTRIC POWER GENERATION WITH USING RECYCLED ASPHALT PAVEMENT MATERIAL
Shoji Yokohama
International Journal of GEOMATE, 22, 89, International Journal of Geomate, 01 Jan. 2022, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal, 12255867

Feasibility of total system for ground protection – power generation - construction waste material reusing
Shoji Yokohama
Japanese Geotechnical Society Special Publication, 9, 9, 418, 423, The Japanese Geotechnical Society, 12 Oct. 2021, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal, 12255867

Study on ground strengthening and power generation by using both of recycled asphalt pavement material and temperature of ground surface
Shoji Yokohama
第14回環境地盤工学シンポジウム発表論文集, 207, 212, Sep. 2021, [Lead author, Corresponding author]
Japanese, Scientific journal

Reconnaissance report on geotechnical damage caused by 2018 Hokkaido Eastern Iburi earthquake with JMA seismic intensity 7
Tatsuya Ishikawa; Masayuki Yoshimi; Koichi Isobe; Shoji Yokohama
Soils and Foundations, 61, 4, 1151, 1171, Elsevier BV, Aug. 2021
Scientific journal

Fundamental study on the total system of ground protection, power generation and construction waste material reusing
Shoji Yokohama
第14回地盤改良シンポジウム論文週, 271, 276, Dec. 2020, [Lead author, Corresponding author]
Japanese, Scientific journal, 12255867

Techniques for the effective use of recycled asphalt pavement material as a civil engineering material
Atsuko Sato; Osamu Hatakeyama; Kakuto Morita; Shoji Yokohama
Japanese Geotechnical Society Special Publication, 8, 5, 149, 154, The Japanese Geotechnical Society, 14 Mar. 2020, [Last author]
English, Scientific journal

Experimental study on protection and power generation on the ground covered by recycled asphalt pavement material
Shoji Yokohama
第13回環境地盤工学シンポジウム発表論文集, 351, 358, Sep. 2019, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, Scientific journal, 12255867

CYCLIC MECHANICAL PROPERTIES OF SANDY SOILS BY MIXING RECYCLED ASPHALT PAVEMENT MATERIAL
Shoji Yokohama
International Journal of GEOMATE, 16, 58, International Journal of Geomate, 01 Jun. 2019, [Peer-reviewed]
English, Scientific journal, 12255867

地盤補強-発電-廃材リユースのトータルシステム具現化に関する基礎的検討
横浜 勝司
地盤工学会北海道支部技術報告集, 59, 59, 9, 16, Jan. 2019, [Peer-reviewed]
Japanese, Scientific journal

アスファルト廃材の長期圧縮挙動と排水強度特性
横浜 勝司; 佐藤 厚子
第13回地盤改良シンポジウム論文集, 13, 437, 442, Oct. 2018, [Peer-reviewed]
Japanese, Scientific journal

Mechanical behavior of sand bed-coastal structure system subjected to cyclic loading
Shoji Yokohama; Seiichi Miura; Shima Kawamura; Masahiro Miyaura
ISRM International Symposium 2000, IS 2000, International Society for Rock Mechanics, 2018
English, International conference proceedings

アスファルト廃材を用いた盛土の現地調査
松本博志; 佐藤厚子; 横濱勝司
全地連「技術フォーラム2017」旭川 発表論文, 2017
Japanese, Research society

アスファルト廃材の混合による砂質土の繰返し強度向上に関する研究
横浜勝司; 佐藤厚子
第12回環境地盤工学シンポジウム発表論文集, 12, 53, 58, 2017, [Peer-reviewed]
Japanese, Symposium

アスファルト廃材の地盤材料としての性質
佐藤厚子; 横浜勝司
第12回環境地盤工学シンポジウム発表論文集, 12, 47, 52, 2017, [Peer-reviewed]
Japanese, Symposium

アスファルト廃材の地盤改良材としての有効活用
佐藤厚子; 林憲裕; 横浜勝司
第12回地盤改良シンポジウム論文集, 12, 307, 314, 2016, [Peer-reviewed]
Japanese, Symposium

アスファルト廃材と砂質土の混合材の静的力学特性
横浜勝司; 佐藤厚子
第12回地盤改良シンポジウム論文集, 12, 301, 306, 2016, [Peer-reviewed]
Japanese, Symposium

アスファルト廃材を用いた土構造物の保護に関する研究
横浜勝司; 佐藤厚子
地盤工学会誌, 64, 11/12, 34, 35, 2016, [Peer-reviewed]
Japanese, Scientific journal

Effects of compaction conditions on undrained strength and arrangements of soil particles for Shikotsu volcanic soil
S. Yokohama
VOLCANIC ROCKS AND SOILS, 103, 104, 2016, [Peer-reviewed]
English, International conference proceedings

アスファルト再生材と豊浦砂の混合材料に関する力学特性
横浜勝司; 福島宏文
第11回環境地盤工学シンポジウム論文集, 269, 274, Jul. 2015, [Peer-reviewed]
Japanese, Symposium

アスファルト再生骨材と笠岡粘土の混合材の力学特性に関する研究
福島宏文; 横浜勝司; 山梨高裕; 佐藤厚子
第11回環境地盤工学シンポジウム論文集, 261, 268, Jul. 2015, [Peer-reviewed]
Japanese, Symposium

Cyclic deformation- strength evaluation of compacted volcanic soil subjected to freeze-thaw sequence
Satoshi Matsumura; Seiichi Miura; Shoji Yokohama; Shima Kawamura
SOILS AND FOUNDATIONS, 55, 1, 86, 98, Feb. 2015, [Peer-reviewed]
English, Scientific journal

Numerical simulation of volcanic soil slope failure under coupled freeze-thaw and rainfall infiltration effects
Srikrishnan Siva Subramanian; Tatsuya Ishikawa; Shoji Yokohama; Tetsuya Tokoro
6th Japan-China Geotechnical Symposium, SJGS 2015, 5, 10, Japanese Geotechnical Society, 2015, [Peer-reviewed]
English, International conference proceedings

Change in the hydromechanical characteristics of embankment material due to compaction state conditions
Shoji Yokohama; Seiichi Miura; Satoshi Matsumura
SOILS AND FOUNDATIONS, 54, 4, 731, 747, Aug. 2014, [Peer-reviewed]
English, Scientific journal

Field monitoring of embankment constructed by volcanic soil and its evaluation
S. Kawamura; S. Miura; S. Yokohama; A. Kudo; N. Kaiya
Geotechnical Special Publication, 231, 373, 382, American Society of Civil Engineers (ASCE), 2013
English, International conference proceedings

EFFECTS OF COMPACTION CONDITIONS ON CYCLIC UNDRAINED SHEAR PROPERTIES OF SANDY-SILT SOILS AND ITS EVALUATION
松村聡; 三浦清一; 横浜勝司
Doboku Gakkai Ronbunshuu C, 68, 4, 597, 609, Japan Society of Civil Engineers, Nov. 2012, [Peer-reviewed]
Japanese, Scientific journal, Embankment structures in Japan have been subjected to a large number of earthquakes and as a result some of them leads to the failure of embankments. Therefore it can be unavoidable to develop the evaluation of seismic performance and the seismic design to constructed embankments. At present embankment is constructed fundamentally by managing degree of compaction D_c (%) at higher water content than the optimum water content w_opt (%). However, it is pointed out that the difference of water content at compaction has some effects on mechanical characteristics of compacted soil even if the same degree of compaction is obtained. Furthermore, it has been gradually revealed that the mechanical characteristics can be remarkably improved due to achieving as the high degree of compaction as possible.
 Keeping in view the above, a series of cyclic undrained triaxial tests was carried out on compacted and saturated sandy-silt soil, which was actually adopted as a dike material. The specimens were prepared by compaction at the different water content with various compaction energy E_c (kN/m³) in order to compare with effects of compaction condition such as the degree of compaction and water content on seismic characteristics. Experimental results show that the samples compacted at lower water content than the optimum water content w_opt (%) are stronger than the samples compacted at higher water content than w_opt under the same degree of compaction. It is also confirmed that the deformation due to cyclic loading develops rapidly at drier side of w_opt rather than at wetter side of w_opt. Thus, it is inferred that seismic performance of embankment greatly relies on some factors such as degree of compaction and water content.

Mechanical properties and soil fabric of compacted embankment
YOKOHAMA Shoji
Proceedings of International conference on gound improvement and ground control(IGCI Wollongong 2012), 1089, 1094, Oct. 2012, [Peer-reviewed]
English, International conference proceedings

Seismic behavior of embankment constructed by different compaction methods
MATSUMUIRA Satoshi; MIURA Seiichi; YOKOHAMA Shoji
Proceedings of International conference on gound improvement and ground control(IGCI Wollongong 2012), 1047, 1053, Oct. 2012, [Peer-reviewed]
English, International conference proceedings

Bearing capacity improvement of anisotropic sand ground and its evaluation
KAWAMURA Shima; MIURA Seiichi; YOKOHAMA Shoji
Proceedings of International conference on gound improvement and ground control(IGCI Wollongong 2012), 755, 761, Oct. 2012, [Peer-reviewed]
English, International conference proceedings

EFFECT OF COMPACTION CONDITION ON STRENGTH, PERMEABILITY AND SHEAR MODULUS OF SANDY SILT AS EMBANKMENT MATERIAL
横浜勝司; 三浦清一; 松村聡
Doboku Gakkai Ronbunshuu C, 68, 2, 422, 432, Japan Society of Civil Engineers, Jun. 2012, [Peer-reviewed]
Japanese, Scientific journal, In order to reveal change in mechanical characteristics of soil due to difference of compaction condition, a series of laboratory tests on sandy silt which was used as embankment material are performed. In those tests, shear strength, shear modulus and coefficient of permeability are measured under the various compaction conditions. Firstly, it is shown that shear strength of the specimen prepared at the optimum water content is higher than these of drier and wetter condition at the lower confining pressure. On the other hand, it is found that vertical permeability and shear modulus of the specimens depend on the degree of compaction and water content at compaction. At the same compaction energy, the permeability and the shear modulus show the minimum and maximum values at the wetter situation. Those experimental facts are reflected to the change in the soil fabric of specimen due to the compaction. In order to reveal the correlations among the shear strength, shear modulus and permeability coefficient prepared at the various compaction conditions are graphically-illustrated. Those explain that (1) increase of the permeability coefficient makes the strength reduction, (2) the shear strength increase in almost directly proportion to the shear modulus of compacted specimen. In this study, it is attempted to express the patterns for fabrics of compacted soil. At the compaction under drier condition, the finer particles generally stand up and coarse particles lay horizontally. By contrast, under wetter condition, the finer particles lay horizontally and coarse particles almost stand up. Those may explain reasonably the effects of condition of compaction on the mechanical properties.

Landslides in Kiyota-ku, Sapporo, induced by the shallow earthquake (M4.6), Dec. 2, 2010
TAJIKA Jun; ISHIMARU Satoshi; KAWAKAMI Gentaro; OKAZAKI Noritoshi; YOKOHAMA Shoji; MIURA Seiichi
Landslides, 49, 2, 75, 79, The Japan Landslide Society, 25 Mar. 2012
Japanese

Change in mechanical characteristics of embankment material by compaction control and its evaluation
S. Yokohama; S. Miura; S. Matsumura
ADVANCES IN TRANSPORTATION GEOTECHNICS II, 364, 369, 2012, [Peer-reviewed]
English, International conference proceedings

Effects of compaction condition on seismic performance of dike embankment and its evaluation
S. Matsumura; S. Miura; S. Yokohama
ADVANCES IN TRANSPORTATION GEOTECHNICS II, 334, 339, 2012, [Peer-reviewed]
English, International conference proceedings

Rainfall-induced failure of volcanic slope with crushable particles subjected to freeze-thaw action
S. Kawamura; S. Miura; S. Yokohama
Geotechnical Special Publication, 211, 3598, 3608, 2011
English, International conference proceedings

MECHANICAL BEHAVIOR OF ANISOTROPIC SAND GROUND BENEATH STRUCTURES SUBJECTED TO CYCLIC LOADING SUCH AS WAVE LOADING
Shima Kawamura; Seiichi Miura; Shoji Yokohama
SOILS AND FOUNDATIONS, 50, 5, 645, 657, Oct. 2010
English, Scientific journal

Anisotropy in Mechanical Behavior of Seabed bearing Caisson Type Breakwaters and its Evaluation
TAKIMOTO Shogo; MIURA Seiichi; KAWAMURA Shima; YOKOHAMA Shoji
PROCEEDINGS OF THE JAPANESE CONFERENCE ON COASTAL ENGINEERING, 66, No.1-B2-66, 906, 910, Japan Society of Civil Engineers, 2010
English, This paper presents the fundamentals of mechanical behavior of anisotropic sand beds subjected to the loading by wave-structure interactions. A series of model tests was performed on a model structure by using the soil box with two-dimensional plane strain condition and the Toyoura sand ground to clarify mechanical behavior of the anisotropic sand beds bearing structures such as caisson type breakwaters. In particular, effect of fabric anisotropy on bearing capacity was examined in detail. Based on the experimental results in which the shape of plastic wedge zone of anisotropic ground at the peak of bearing capacity was strongly depending on the initial sand deposition condition, an evaluation method for the bearing capacity was also proposed according to the upper bound solution in the limit analysis.

RAINFALL-INDUCED FAILURE OF UNSATURATED VOLCANIC SLOPE SUBJECTED TO FREEZE-THAW ACTION AND ITS MECHANISM
KAWAMURA Shima; MIURA Seiichi; ISHIKAWA Tatsuya; YOKOHAMA Shoji
Doboku Gakkai Ronbunshuu C, 66, 3, 577, 594, Japan Society of Civil Engineers, 2010
Japanese,   Collapse of slope formed from volcanic soils has been frequently caused in Hokkaido, Japan. This study aims at clarifying failure mechanism of volcanic slope caused by both rainfall and freeze-thaw action. In particular, the effects of freeze-thaw action, slope angle, density and friction of impermeable layer in the slope on mechanical behavior were detailedly investigated on volcanic slopes having several shapes. The results showed that; surface slope failure depends strongly on slope angle, the friction characteristics of impermeable layer and rainfall intensity, and the formation of frozen layer in spring season and the softening of slope by freeze-thaw action in summer season are important for evaluating the stability of volcanic slope.

EFFECT OF FREEZE-THAW SEQUENCE ON DEFORMATION PROPERTIES OF CRUSHABLE VOLCANIC SOIL
Masahiko YAMAKI; Seiichi MIURA; Shoji YOKOHAMA
Doboku Gakkai Ronbunshuu C, 65, 1, 321, 333, 2009

破砕性火山灰土の変形特性に及ぼす凍結融解履歴の影響
山木 正彦; 三浦 清一; 横浜 勝司
土木学会論文集C（CD-ROM）, 65, 1, 321, 333, 2009

Mechanical behavior of anisotropic sand ground bearing coastal structure and its evaluation
S. Takimoto; S. Miura; S. Kawamura; S. Yokohama
PREDICTION AND SIMULATION METHODS FOR GEOHAZARD MITIGATION, 17, +, 2009, [Peer-reviewed]
English, International conference proceedings

堆積構造異方性が繰返し荷重下にある支持地盤の変形特性に及ぼす影響
川村 志麻; 三浦 清一; 横浜 勝司
土木学会論文集C（CD-ROM）, 63, 1, 81, 92, 土木学会, 2007
Japanese, 繰返し力を受ける異方性砂地盤の変形特性を調べるために，二次元平面ひずみ模型土槽と種々の荷重を載荷可能な装置を用いた一連の実験が行われた．得られた結果から，構造物に正弦波的な繰返し力が作用し，ロッキングを生じるような場合では，繰返し力によって変化する最大主応力方向αと地盤の堆積方向βとのなす角ψ(=|β－α|)がある値(本試験の豊浦砂では約40°)に最も近い堆積方向に，構造物は沈下－傾斜することが明らかにされている．また，繰返しに伴う変形の卓越方向を支配する要因が詳細に検討されている．

繰返し応力レベルによる海洋構造物支持地盤の力学特性変化とその評価法
横浜 勝司; 三浦 清一; 中野 文裕
土木学会海岸工学論文集, 53, 881, 885, Japan Society of Civil Engineers, 2006
Japanese, 様々な大きさの波浪荷重を長期間支える海洋構造物の基礎地盤には, 常に波カー構造物一地盤の動的相互作用による繰返しせん断応力が伝播している. 伝播した応力によって地盤内にはダイレイタンシーに伴う堆積構造や剛性の変化が誘発される. その結果, 構造物・地盤系の安定性が低下する可能性がある. 本研究では構造物下部の砂地盤の変形挙動を合理的に評価することを目的に, 排水条件での要素試験を実施して繰返しせん断を受ける砂のせん断剛性率の変化を調べた. さらに, 一連の試験で得られた剛性変化挙動を反映させた変形解析を実施しその有効性を検討している.

Strength characteristics of crushable volcanic soils at various degrees of saturation
T. Ishikawa; S. Miura; S. Yokohama; R. G. Mijares
Geomechanics and Geotechnics of Particulate Media, 121, 126, 2006
English, International conference proceedings

Two and three-dimensional modeling of abutment-backfill system on soft ground
S. Dashdorj; S. Miura; S. Yokohama; K. Masumura
Numerical Methods in Geotechnical Engineering, 759, 764, 2006, [Peer-reviewed]
English, International conference proceedings

「繰返し波浪荷重を受ける海洋構造物・地盤系の側方流動変形に関する解析」
横浜 勝司; 三浦 清一; 川村 志麻; 呉 哲浩
『海岸工学論文集』, 52, 2, 841, 845, Japan Society of Civil Engineers, 2005
Japanese, 波浪による被害を最小限にするために, 防波構造物や港湾施設の防波性能は常に保持される必要がある. そのためには, 波浪に対する構造物の耐久性だけでなく支持地盤の安定性を検討することが必須となる. 本研究では波浪のような繰返し荷重によって変化する砂のせん断特性を考慮した解析法を提案している. 構造物直下の地盤を対象とした繰返し三軸試験では, 繰返し載荷によって発生した砂のひずみが0.1%未満で砂のせん断剛性率が急減することが示された. 要素試験で見られた砂の剛性低下挙動を考慮した繰返し力を受ける構造物・地盤系の変形解析が進められた. 特に3次元および2次元平面ひずみ条件での解析を行い, 解析の次元の違いが支持地盤の変形評価に及ぼす影響が明示された.

繰返しせん断による砂質土の剛性変化を考慮した海洋構造物・地盤系の変形解析
横浜 勝司; 三浦 清一
『土木学会海岸工学論文集』, Vol.51, 831, 835, Japan Society of Civil Engineers, 2004
Japanese, 半永久的な繰返し波浪を受ける海洋構造物・地盤系では, 動的相互作用や地盤内の間隙水圧挙動によって沈下等の変形が進行的に発生する. このような変形挙動は構造物・地盤系の安定性低下の一因となる. これらの構造物の合理的な維持・管理のためには, 支持地盤も含めた全体系の安定性評価法を見出すことが必要とされる. 本研究では, ベンダーエレメントを設置した非排水繰返し三軸試験機による要素試験を実施し, 繰返しせん断中の砂のせん断剛性率を測定した. 一連の要素試験より得られた結果を考慮した構造物・地盤系の変形解析法を提案した. 本解析法によって構造物の沈下性状や地盤内の側方変形挙動を良く評価できることが示されている.

異方的に堆積した海底砂地盤の流動変形とその発達のメカニズム
三浦 清一; 川村 志麻; 横浜 勝司
『土木学会海岸工学論文集』, Vol.51, 811, 815, 土木学会, 2004
Japanese, 海洋構造物を支持する砂地盤の流動現象を評価するために, 波浪のような荷重を再現した一連の模型実験を行った. 本研究では, 今までに明らかにした構造物支持地盤の強度-変形が地盤の堆積構造 (構造異方性) に強く依存するという事実に基づき, 海洋構造物を支持する異方性地盤の流動変形のメカニズムとその沈下・流動方向を決定する要因を明らかにし, 側方流動変形の卓越方向推定のための方法を検討した. その結果, 原地盤のサンプリング情報等に基づいて地盤の堆積方向βを決定し, 波浪条件 (偏心度など) から支持地盤内に生じる最大主応力方向αを算出すれば, 海底砂地盤の流動方向の推定が可能になる等の事実が示されている.

9月26日発生の2003年十勝沖地震緊急地盤災害調査速報(ニュース)
三浦 清一; 石川 達也; 横濱 勝司
土と基礎, 51, 12, 77, 81, 社団法人地盤工学会, 01 Dec. 2003
Japanese

Deformation behavior of structure-sand deposits subjected to cyclic loading and FE analysis
S Yokohama; S Miura; S Kawamura
DEFORMATION CHARACTERISTICS OF GEOMATERIALS, 809, 815, 2003
English, International conference proceedings

Anisotropy in bearing capacity-lateral deformation behavior of sand ground
S Kawamura; S Miura; S Yokohama
DEFORMATION CHARACTERISTICS OF GEOMATERIALS, 1303, 1310, 2003
English, International conference proceedings

「支持地盤の剛性及び強度変化を考慮した海洋構造物・地盤系の変形解析法」
横浜 勝司; 三浦 清一; 林 秀人
『海岸工学論文集』, Vol.50, 876, 880, Japan Society of Civil Engineers, 2003
Japanese, 波浪等の厳しい外力条件下にある海洋構造物は荷重を繰返し受けて振動している. この状況では構造物と支持地盤との動的相互作用によって下部地盤には側方流動型の大変形が発生し構造物・地盤系の安定性が低下することが考えられる. このような繰返し載荷が構造物・地盤系の安定性低下に及ぼす影響は大きく, その評価法を見出すことは極めて重要である. 本研究では, 一連の模型試験及び数値解析を行い構造物の沈下や傾斜に伴う支持砂地盤の変形挙動を評価する手法を検討している. 特に砂の剛性変化および強度変化を考慮した解析モデルを組込んだ解析法を提案した. 解析結果と模型試験による実測値を比較することで本解析法の適用性を検討した.

DEFORMATION BEHAVIOR OF STRUCTURE-GROUND SYSTEM SUBJECTED TO STATIC AND CYCLIC LOADINGS AND ITS PREDICTION
YOKOHAMA Shoji; MIURA Seiichi; KAWAMURA Shima
Doboku Gakkai Ronbunshu, 715, 263, 275, 土木学会, 21 Sep. 2002
Japanese, 波浪のような繰返し荷重を受ける構造物・地盤系の安定性評価法確立のために必要な, 地盤の流動変形を考慮した構造物の変位量の推定法を明らかにすることを目的に, 二次元平面ひずみ模型土槽装置を用いた一連の実験と解析を行った. 本研究では, 特に構造物の沈下挙動と地盤の側方流動変形挙動を詳細に調べている. 具体的には, 静的及び繰返し荷重場にある地盤の側方流動挙動をFEM解析によって検討し, 任意荷重場の地盤・構造物系の変形挙動を再現できるような解析法を検討している. また, 解析から得た側方流動変形挙動を考慮した構造物変位量の推定式を提案した. 推定式は, 構造物天端2地点で計測された鉛直変位量から繰返し荷重場にある構造物の変位量を精度良く推定することが示されている.

DEFORMATION BEHAVIOR OF STRUCTURE-GROUND SYSTEM SUBJECTED TO STATIC AND CYCLIC LOADINGS AND ITS PREDICTION
横浜 勝司; 三浦 清一; 川村 志麻
『土木学会論文集』, No.715/III-60, ,pp.263-275, 275, 土木学会, 2002
Japanese, 波浪のような繰返し荷重を受ける構造物・地盤系の安定性評価法確立のために必要な, 地盤の流動変形を考慮した構造物の変位量の推定法を明らかにすることを目的に, 二次元平面ひずみ模型土槽装置を用いた一連の実験と解析を行った. 本研究では, 特に構造物の沈下挙動と地盤の側方流動変形挙動を詳細に調べている. 具体的には, 静的及び繰返し荷重場にある地盤の側方流動挙動をFEM解析によって検討し, 任意荷重場の地盤・構造物系の変形挙動を再現できるような解析法を検討している. また, 解析から得た側方流動変形挙動を考慮した構造物変位量の推定式を提案した. 推定式は, 構造物天端2地点で計測された鉛直変位量から繰返し荷重場にある構造物の変位量を精度良く推定することが示されている.

「波浪力のような繰返し載荷を受ける支持地盤の側方流動変形の推定法」
横浜 勝司; 三浦 清一
『応用力学論文集』, Vol.5, 473, 480, 土木学会, 2002
Japanese

「波浪のような繰返し力を受ける構造物支持地盤の流動破壊と解析法に関する研究」
横浜 勝司; 三浦 清一; 林 秀人
『海岸工学論文集』, Vol.49, 851, 855, Japan Society of Civil Engineers, 2002
Japanese, 波浪場にある構造物・地盤系では, 外力-構造物-地盤の動的相互作用によって基礎地盤の支持力低下や側方流動型の大変形が誘発される現象が見られる. したがって, 繰返し荷重を受ける構造物・地盤系の安定性を管理するために, 地盤内の側方流動特性を把握することが重要となる. 本研究では一連の有限要素解析および模型試験を行い, 繰返し載荷場での構造物支持地盤の剛性変化特性を調べた. さらに地盤の剛性変化特性を考慮した変形解析法を提案した. 提案法は波浪のような繰返し力を受ける地盤の流動変形を評価するために有効であることが示された.

CHANGE IN BEARING CAPACITY-DEFORMATION BEHAVIOR OF STRUCTURE-SAND GROUND SYSTEM DUE TO DIFERENCE IN TYPES OF LOADING AND ITS EVALUATION
MIYAURA Masahiro; MIURA Seiichi; KAWAMURA Shima; YOKOHAMA Shoji
Doboku Gakkai Ronbunshu, 673, 673, 121, 131, Japan Society of Civil Engineers, 21 Mar. 2001
Japanese, In order to clarify bearing capacity of a structure-sand ground system subjected to various types of loading, a series of model tests were carried out under several static and cyclic loading conditions. It was found that; (1) lateral flow behavior of the ground depends strongly on the settlement performance of a structure, (2) bearing capacity of the ground can be evaluated by a failure envelope which is depicted in M-V-H plane irrespective of the difference in loading conditions, and (3) stability of the sand ground-structure system may be evalutated by using the parameter V_δ/V_ρ which is adopted as the measure of lateral deformation volume in this study.

「構造物支持地盤の側方変形特性に及ぼす諸要因の影響」
『第46回地盤工学シンポジウム論文集』, Vol.46, 173, 180, 2001

CHANGE IN BEARING CAPACITY-DEFORMATION BEHAVIOR OF STRUCTURE-SAND GROUND SYSTEM DUE TO DIFERENCE IN TYPES OF LOADING AND ITS EVALUATION
MIYAURA Masahiro; MIURA Seiichi; KAWAMURA Shima; YOKOHAMA Shoji
Doboku Gakkai Ronbunshu, 673, 673, 121, 131, Japan Society of Civil Engineers, 2001
Japanese, In order to clarify bearing capacity of a structure-sand ground system subjected to various types of loading, a series of model tests were carried out under several static and cyclic loading conditions. It was found that; (1) lateral flow behavior of the ground depends strongly on the settlement performance of a structure, (2) bearing capacity of the ground can be evaluated by a failure envelope which is depicted in M-V-H plane irrespective of the difference in loading conditions, and (3) stability of the sand ground-structure system may be evalutated by using the parameter V_δ/V_ρ which is adopted as the measure of lateral deformation volume in this study.

「波浪力を受ける海洋構造物支持地盤の異方性を考慮した側方流動変形の推定法に関する研究」
『海岸工学論文集』, Vol.48, 986, 990, 2001

「地盤の剛性変化を考慮した構造物・地盤系の側方流動変形解析」
『応用力学論文集』, Vol.4, 397, 404, 2001

「波浪場にある海洋構造物－地盤系の支持力安定性を支配する要因とその評価法」
『海岸工学論文集』, Vol.48, 1011, 1015, 2001

波浪場にある海洋構造物-地盤系の支持力安定性を支配する要因とその評価法
三浦 清一; 川村 志麻; 柴田 泰孝; 横浜 勝司
海岸工学論文集, 48, 986, 990, Japan Society of Civil Engineers, 2001
Japanese

波浪力を受ける海洋構造物支持地盤の異方性を考慮した側方流動変形の推定法に関する研究
川村 志麻; 三浦 清一; 横浜 勝司
海岸工学論文集, 48, 1011, 1015, 土木学会, 2001
Japanese

波浪力のような繰返し荷重場にある構造物－地盤系の安定性評価に関する実験
横浜 勝司; 三浦 清一; 川村 志麻; 宮浦 征宏
土木学会海岸工学論文集, 47, 936, 940, 土木学会, 2000
Japanese

静的および繰返し荷重を受ける砂地盤-構造物系の変形挙動の解析
土木学会応用力学論文集, 3, 513, 520, 2000

Mechanical behavior of sand bed-coastal system subjected to cyclic loading
Proc., International Conference on Geotechnical and Geological Engineering, 500, 2000

MODEL EXPERIMENTS ON FAILURE OF SAND BED BENEATH A STRUCTURE SUBJECTED TO CYCLIC LOADING AND ITS COUNTERMEASURE
KAWAMURA Shima; MIURA Seiichi; YOKOHAMA Shoji; MIYAURA Masahiro
Doboku Gakkai Ronbunshu, 624, 77, 89, 土木学会, 21 Jun. 1999
Japanese, 波浪のような繰返し力を受ける構造物支持地盤の破壊機構とその防止策について, 種々の繰返し力を載荷可能な装置と二次元平面ひずみ試験土槽装置を用いて一連の実験を行い, 次のような結果を得た. 1) 波浪場にある地盤-構造物系の破壊は変形が徐々に進行するような側方流動型破壊を示す, 2) このような地盤破壊の防止策として, 構造物底部に側壁を設ける方法や地盤内に矢板を設置するような対策法は, 側方流動型の破壊阻止に一定の効果が期待できるが, その効果はそれらの形状及び設置条件によってかなり異なる. 本論文では, このような側方流動型破壊の基本的な阻止機構について詳細な検討が加えられている.

MECHANICAL BEHAVIOR OF SAND BED BENEATH A STRUCTURE SUBJECTED TO CYCLIC LOADING
KAWAMURA Shima; MIURA Seiichi; YOKOHAMA Shoji; MIYAURA Masahiro
Doboku Gakkai Ronbunshu, 624, 65, 75, 土木学会, 21 Jun. 1999
Japanese, 波浪のような繰返し力を受ける構造物支持地盤の動的力学挙動を調べるために, 外力の作用方向の異なる基本的な実験が二次元平面ひずみ土槽装置と種々の繰返し力を載荷可能な装置を用いて行われた. 一連の実験と解析から, 1) 波浪と構造物の相互作用によって誘発される構造物直下のせん断応力は地盤深さによってその大きさは変化するものの, 完全両振りの条件にある, 2) 波浪のような外力を鉛直及び水平方向に分担させた試験では, 通常の室内繰返しせん断試験と同様な結果の整理が可能である, 3) このような繰返し力を受ける構造物支持地盤の動的力学挙動を評価するには, せん断応力と外力の作用方向の適確な把握が極めて重要である, などの事実が示されている.

地盤の変形特性を考慮した海洋構造物の変位量推定法
宮浦 征宏; 三浦 清一; 横浜 勝司; 川村 志麻
土木学会海岸工学論文集, 46, 936, 940, 土木学会, 1999
Japanese

Mechanical behaviors of sand bed-structure system subjected to cyclic loadings
Proc., 11th Asian regional conference on Soil Mechanics and Geotechnical Engineering, 161, 1999

MODEL EXPERIMENTS ON FAILURE OF SAND BED BENEATH A STRUCTURE SUBJECTED TO CYCLIC LOADING AND ITS COUNTERMEASURE
川村志麻; 三浦清一; 横浜勝司; 宮浦征宏
土木学会論文集, 624, 77, 89, 土木学会, 1999
Japanese, 波浪のような繰返し力を受ける構造物支持地盤の破壊機構とその防止策について, 種々の繰返し力を載荷可能な装置と二次元平面ひずみ試験土槽装置を用いて一連の実験を行い, 次のような結果を得た. 1) 波浪場にある地盤-構造物系の破壊は変形が徐々に進行するような側方流動型破壊を示す, 2) このような地盤破壊の防止策として, 構造物底部に側壁を設ける方法や地盤内に矢板を設置するような対策法は, 側方流動型の破壊阻止に一定の効果が期待できるが, その効果はそれらの形状及び設置条件によってかなり異なる. 本論文では, このような側方流動型破壊の基本的な阻止機構について詳細な検討が加えられている.

MECHANICAL BEHAVIOR OF SAND BED BENEATH A STRUCTURE SUBJECTED TO CYCLIC LOADING
川村志麻; 三浦清一; 横浜勝司; 宮浦征宏
土木学会論文集, 624, 65, 75, 土木学会, 1999
Japanese, 波浪のような繰返し力を受ける構造物支持地盤の動的力学挙動を調べるために, 外力の作用方向の異なる基本的な実験が二次元平面ひずみ土槽装置と種々の繰返し力を載荷可能な装置を用いて行われた. 一連の実験と解析から, 1) 波浪と構造物の相互作用によって誘発される構造物直下のせん断応力は地盤深さによってその大きさは変化するものの, 完全両振りの条件にある, 2) 波浪のような外力を鉛直及び水平方向に分担させた試験では, 通常の室内繰返しせん断試験と同様な結果の整理が可能である, 3) このような繰返し力を受ける構造物支持地盤の動的力学挙動を評価するには, せん断応力と外力の作用方向の適確な把握が極めて重要である, などの事実が示されている.

Model experiment on mechanical response of seabed-coastal structure system to ocean wave
S Miura; S Kawamura; S Yokohama; M Miyaura
EARTHQUAKE GEOTECHNICAL ENGINEERING, VOLS 1-3, 321, 326, 1999, [Peer-reviewed]
English, International conference proceedings

波浪力を受ける砂地盤の変形特性を考慮した海洋構造物の変位量推定法
三浦 清一; 横浜 勝司; 川村 志麻; 宮浦 征宏
土木学会海岸工学論文集, 45, 876, 880, 土木学会, 1998
Japanese

Wave-induced flow deformation of seabed bearing structures
S Kawamura; S Miura; S Yokohama; Y Hagihara
DEFORMATION AND PROGRESSIVE FAILURE IN GEOMECHANICS - IS-NAGOYA'97, 571, 576, 1997, [Peer-reviewed]
English, International conference proceedings

磁界による砂地盤の支持力向上および応力伝播挙動に関する実験的検討
尾崎圭汰; 横浜勝司, 第59回地盤工学研究発表会発表講演集, Jul. 2024
Summary national conference

土砂ガードを設置した掘削地盤の破壊遅延効果の実験的検討
西山遼; 横浜勝司; 玉手聡; 堀智仁; 菊田亮一, 第59回地盤工学研究発表会発表講演集, Jul. 2024
Summary national conference

浅い溝掘削工事における土砂ガードの有用性についての実験的検討
斎藤怜太; 横浜勝司; 玉手聡; 堀智仁; 菊田 亮一, 第59回地盤工学研究発表会発表講演集, Jul. 2024
Summary national conference

斜面崩壊に対する表層ひずみ棒センサーの反応に関する屋外計測
横浜勝司; 玉手聡; 堀智仁; 菊田亮一, 第59回地盤工学研究発表会発表講演集, Jul. 2024, [Lead author]
Summary national conference

掘削地盤の崩壊土砂を受け止める土砂ガードの変形挙動
横浜勝司; 玉手聡; 堀智仁; 菊田亮一, 第58回地盤工学研究発表会発表講演集, Jul. 2023
Summary national conference

アスファルト舗装再生砕石とウッドチップを敷設した地盤の温度を用いた発電の試み
横浜勝司, 第57回地盤工学研究発表発表講演集, Jul. 2022, [Lead author]
Summary national conference

補強部材の挿入および電磁力の活用による砂地盤の支持力向上に関する研究
柳澤岳幸; 横浜勝司, 第56回地盤工学研究発表会発表講演集, Jul. 2021
Summary national conference

亀裂を有する地盤側面に設置した簡易地盤ガードによる地盤崩壊の抑制に関する研究
西岡仁史; 横浜勝司, 第56回地盤工学研究発表会発表講演集, Jul. 2021
Summary national conference

アスファルト再生砕石で被覆した地盤の温度を電力に変換するシステム
平川貴章; 横浜勝司, 第56回地盤工学研究発表会発表講演集, Jul. 2021
Summary national conference

アスファルト廃材被覆とPGユニット挿入を施した地盤の繰返し力学挙動および発電挙動
横浜勝司, 地盤工学会北海道支部技術報告集(CD-ROM), 60, 2020

地盤ガードによる崩壊土砂移動防止に関する実験的検討
横浜勝司, 土木学会年次学術講演会講演概要集(CD-ROM), 75th, 2020

Field monitoring for the power generation by using the temperature on the ground covered by recycled asphalt pavement material
横浜勝司, 地盤工学研究発表会発表講演集(Web), 55th, 2020

Experimental study on the total system for ground improvement-power generation-reusing waste material
横浜勝司, 地盤工学研究発表会発表講演集(Web), 54th, 2019

アスファルト廃材で被覆した地盤の温度を利用した発電の可能性
横浜勝司; 佐藤厚子, 地盤工学研究発表会発表講演集(CD-ROM), 53rd, 2018

アスファルト廃材・支笏系火山灰質土混合材の力学特性
横浜勝司; 佐藤厚子, 地盤工学会北海道支部技術報告集(CD-ROM), 57, 2017

アスファルト廃材を混合した砂質土の繰返し非排水強度
横浜勝司; 佐藤厚子, 地盤工学研究発表会発表講演集(CD-ROM), 52nd, 2017

アスファルト廃材と砂の混合物の繰返しせん断特性
横浜勝司; 佐藤厚子, 地盤工学会北海道支部技術報告集(CD-ROM), 56, 2016

アスファルト廃材の盛土材料としての性質
佐藤厚子; 林憲裕; 横浜勝司, 地盤工学会北海道支部技術報告集(CD-ROM), 56, 2016

アスファルト廃材の加熱温度と強度の関係について
佐藤厚子; 林憲裕; 横浜勝司, 地盤工学研究発表会発表講演集(CD-ROM), 51st, 2016

アスファルト廃材と火山灰質砂質土との混合材料の排水せん断特性
横浜勝司; 佐藤厚子, 地盤工学研究発表会発表講演集(CD-ROM), 51st, 2016

アスファルト廃材と砂の混合物の力学特性に関する研究
横浜勝司; 福島宏文, 地盤工学会北海道支部技術報告集(CD-ROM), 55, 2015

アスファルト再生材と豊浦砂の混合物の排水せん断強度
横浜勝司; 福島宏文, 地盤工学研究発表会発表講演集(CD-ROM), 50th, 2015

寒冷地下にある火山灰土の液状化抵抗評価
松村聡; 三浦清一; 横浜勝司, 地盤工学研究発表会発表講演集(CD-ROM), 49th, 2014

EVALUATION OF SETTLEMENT ON THE CONSTRUCTION OF THE HIGH EMBANKMENT USING ASHITAKA LOAM
NAKAMURA Hirotake; YOKOTA Seiya; FUJIOKA Kazuyori; YOKOHAMA Shoji; MIURA Seiichi, Doboku Gakkai Ronbunshuu C, 70, 1, 125, 134, 2014
High embankment in Shin-Tomei-expressway was built in the Asitaka Loam. This embankment has height of 55 meters. In this site, the significant settlement was concerned over the long term after finishing construction the embankment. This paper shows the data about the settlement obtained by long term observation and laboratory tests. Based on those data, we tried that we evaluated the settlement of construction and future of the high embankment using Ashitaka loam. As a result, it was found that the settlement of embankment under construction produced around 5-9%, the laboratory test had a small settlements for that we calculated from an actual value, the observation during construction at the short span became large settlements, and the residual settlement of around 100cm may occur ten years after the number., Japan Society of Civil Engineers, Japanese

EFFECTS OF COMPACTION CONDITION AND NON-PLASTIC FINES ON UNDRAINED CYCLIC SHEAR STRENGTH OF COARSE-GRAINED VOLCANIC SOILS
MATSUMURA Satoshi; MIURA Seiichi; YOKOHAMA Shoji, Doboku Gakkai Ronbunshuu C, 70, 2, 238, 247, 2014
It is important to reveal mechanical characteristics of compacted soils in order to ensure stable performance for embankments. However, there may be few experimental studies to verify cyclic shear behavior of embankments. Furthermore, the evaluation of liquefaction potential of embankments has been recently pointed out as well as that of foundation below embankments.<br> On the other hand, in Hokkaido, where many kinds of volcanic soils widely deposit, those soils have been often employed as embankment materials. According to previous researches, coarse-grained volcanic soils have some features of fragility and inner-porosity to cause particle breakage which influence the mechanical characteristics of those soils.<br> In this study, for the purpose to evaluate the influential factors on the cyclic shear behavior of embankments, a series of cyclic undrained triaxial tests was carried out on compacted samples using a coarse-grained volcanic soil deposited in Hokkaido. Each triaxial specimen was made in a different condition based on water content at compaction, dry density and finer content. Experimental results show that compaction conditions such as water content and dry density can affect cyclic strength of compacted soils. However, the tendency to cyclic strength may be quite different depending on the difference of finer content., Japan Society of Civil Engineers, Japanese

A Case of Volcanic Slope Failure and Implementation of the Full-scale Model Slope Test
横浜 勝司, 地盤工学会誌, 62, 3, 60, 61, 2014
地盤工学会, Japanese

積雪寒冷地にある斜面の現地計測結果とその考察
川村志麻; 五十嵐はるか; 三浦清一; 石川達也; 横浜勝司, 土木学会年次学術講演会講演概要集(CD-ROM), 65th, 2010

RAINFALL-INDUCED FAILURE OF UNSATURATED VOLCANIC SLOPE SUBJECTED TO FREEZE-THAW ACTION AND ITS MECHANISM
KAWAMURA Shima; MIURA Seiichi; ISHIKAWA Tatsuya; YOKOHAMA Shoji, Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering), 66, 3, 577, 594, 2010
Collapse of slope formed from volcanic soils has been frequently caused in Hokkaido, Japan. This study aims at clarifying failure mechanism of volcanic slope caused by both rainfall and freeze-thaw action. In particular, the effects of freeze-thaw action, slope angle, density and friction of impermeable layer in the slope on mechanical behavior were detailedly investigated on volcanic slopes having several shapes. The results showed that; surface slope failure depends strongly on slope angle, the friction characteristics of impermeable layer and rainfall intensity, and the formation of frozen layer in spring season and the softening of slope by freeze-thaw action in summer season are important for evaluating the stability of volcanic slope., Japan Society of Civil Engineers, Japanese

地盤浸透(不飽和土)(5.地盤中の物質移動,<特集>第43回地盤工学研究発表会)
横浜 勝司, 地盤工学会誌, 56, 12, 29, 29, 01 Dec. 2008
社団法人地盤工学会, Japanese

火山灰地盤の斜面崩壊挙動に対する不連続体解析方法の検討
石川 達也; 三浦 清一; 横浜 勝司; 川村 志麻, 土木学会年次学術講演会講演概要集, 62, 3, 27, 28, Sep. 2007
土木学会, Japanese

降雨による北海道火山灰質土斜面の崩壊とその評価に関する模型実験
井野 寿人; 川村 志麻; 木幡 行宏; 三浦 清一; 石川 達也; 横浜 勝司, 土木学会年次学術講演会講演概要集, 62, 3, 13, 14, Sep. 2007
土木学会, Japanese

EFFECT OF FABRIC ANISOTROPY ON DEFORMATION BEHAVIOR OF GROUND BEARING STRUCTURE SUBJECTED TO CYCLIC LOADING
KAWAMURA Shima; MIURA Seiichi; YOKOHAMA Shoji, Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering), 63, 1, 81, 92, 2007
The present study aims at revealing mechanical behavior of anisotropic ground beneath a structure subjected to cyclic loading. In particular, effect of fabric anisotropy on cyclic strength-lateral flow deformation behavior was investigated by using the soil box apparatus. For example, dependence of fabric anisotropy of the ground on deformation direction was evaluated quantitatively. Test results showed that deformation direction in the ground-structure system depended strongly on the depositional condition of the ground and developed in the direction of bedding plane where the relative angle δ=45°-φ/2-ψ became the smallest in the ground., Japan Society of Civil Engineers, Japanese

堆積構造異方性が繰返し荷重下にある支持地盤の変形特性に及ぼす影響
川村 志麻; 三浦 清一; 横浜 勝司, 土木学会論文集C, 63, 1, 81, 92, 2007
繰返し力を受ける異方性砂地盤の変形特性を調べるために，二次元平面ひずみ模型土槽と種々の荷重を載荷可能な装置を用いた一連の実験が行われた．得られた結果から，構造物に正弦波的な繰返し力が作用し，ロッキングを生じるような場合では，繰返し力によって変化する最大主応力方向αと地盤の堆積方向βとのなす角ψ(=|β－α|)がある値(本試験の豊浦砂では約40°)に最も近い堆積方向に，構造物は沈下－傾斜することが明らかにされている．また，繰返しに伴う変形の卓越方向を支配する要因が詳細に検討されている．, 土木学会, Japanese

粒状体地盤の凍結融解履歴による動的力学挙動の変化
山木正彦; 所哲也; 三浦清一; 石川達也; 横浜勝司, 地盤工学会北海道支部技術報告集, 46, 2006

6. 地盤と構造物 : 基礎一般(杭構造基礎, 実物・現場試験, 事例・開発・その他), 直接基礎(解析・試験, 沈下・変形)(<小特集テーマ>第40回地盤工学研究発表会)
横浜 勝司, 土と基礎, 53, 12, 71, 72, 01 Dec. 2005
社団法人地盤工学会, Japanese

2003年十勝沖地震での地盤災害の特徴
横浜勝司; 三浦清一; 石川達也, 地盤工学研究発表会発表講演集, 40th, 2005

Analysis technique of offshore structure-ground system with considering change of shear modulus of sand measured by laboratory testing
S Yokohama; S Miura; S Kawamura; S Dashdorj, PROCEEDINGS OF THE FIFTEENTH (2005) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 2, 371, 376, 2005
English

Deformation analysis of structure-ground system with shear modulus reduction behavior of sand
Yokohama Shoji; Miura Seiichi; Mishima Hidemasa, Proceedings of the Japan National Conference on Geotechnical Engineering, 39, 0, 1417, 1418, 2004
It is important to investigate the deformation behavior of ground in order to evaluate the stability of coastal structure-ground system. Rigidity variation of ground under cyclic loading condition should be revealed for the deformation analysis. In present study, the effect of excess pore water pressure on rigidity variation of sand at the large strain region is clarified by bender element test. Deformation analysis based on the results of bender element test can explain deformation of structure-ground system under cyclic loading., The Japanese Geotechnical Society

Effect of Lightweight Geomaterial on Reduction of Lateral Earth Pressure and Its Numerical Evaluation
Dashdorj Sarandulam; Miura Seiichi; Yokohama Shoji, Proceedings of the Japan National Conference on Geotechnical Engineering, 39, 0, 745, 746, 2004
As one of the methods to reduce lateral earth pressure on bridge abutment specially constructed in soft ground, lightweight geomaterial have been used for back-filling of bridge abutment. In this study, FEM analysis was carried out to evaluate a reduction of lateral earth pressure and the deformation of lightweight backfill acting behind the bridge abutment. Through the analysis, field measured data of the bridge backfilled with lightweight geomaterial was compared to the analyzed data. It was revealed that the earth pressure of backfill was reduced when the backfill was placed by lightweight geomaterial although the deformation had been still occured., The Japanese Geotechnical Society

2003年十勝沖地震地盤災害調査報告書
『地盤工学会2003年十勝沖地震地盤災害調査委員会』, 2004

Lateral flow deformation analysis of sand ground-structure system taking account of change in rigidity and internal friction angle
Yokohama Shoji; Miura Seiichi; Mishima Hidemasa; Hayashi Hideto, Proceedings of the Japan National Conference on Geotechnical Engineering, 38, 0, 447, 448, 2003
It is necessary for design of ground-structure system that mechanism of lateral flow deformation behavior under cyclic loading condition can be evaluated by simple analysis technique. In this study, a series of FE analysis based on Mohr-Coulomb criteria with non-associated flow rule was preformed. In order to accurately simulate the deformation of ground, a simple relationship between internal friction angle of sand and shear strain is assumed. Analysis technique with considering change in elastic modulus and strength is developed. It is shown that this method may be useful for analysis on lateral flow deformation under cyclic loading conditions., The Japanese Geotechnical Society

Correlation between cyclic shear modulus and unconfined compression strength of air foamed lightweight geomaterial
Dashdorj Sarandulam; Miura Seiichi; Yokohama Shoji, Proceedings of the Japan National Conference on Geotechnical Engineering, 38, 0, 825, 826, 2003
Lightweight geomaterials have been developed and utilized recently for the construction of embankments and earth structures where it is not suitable to use ordinary soil. In this study static and cyclic mechanical behavior of air foamed lightweight geomaterial was investigated. Series of unconfined compression and cyclic triaxial tests were carried out by using 28 days-curing specimens. It was confirmed that the unconfined compression strength and Young′s modulus of the material could be controlled by adjusting dry density, moisture content and curing temperature. Based on the test results, correlation between cyclic shear modulus and unconfined compression strength was predicted., The Japanese Geotechnical Society

Lateral flow deformation analysis of sand ground-structure subjected to cyclic loading and its evaluation
S Yokohama; S Miura, PROCEEDINGS OF THE THIRTEENTH (2003) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 1, 61, 67, 2003
English

FE Analysis for Sand Deposits Subjected to Cyclic Loading as Wave Force
Yokohama Shoji; Miura Seiichi; Hayashi Hideto, Proceedings of the Japan National Conference on Geotechnical Engineering, 37, 0, 515, 516, 2002
The Japanese Geotechnical Society

FEM Analysis for Settlement and Lateral Flow Deformation of Structure-Ground System under Cyclic Loading Condition as Wave field
Yokohama S; Miura S; Kawamura S, Journal of Environmental Science Laboratory, 8, 0, 373, 381, 30 Dec. 2001
In order to analytically mechanical behavior of sand-ground system under cyclic vertical central or eccentric loading condition, a series of FEM analyses and model tests were performed. From the model test, it was observed that the sand deposits beneath a structure subjected to static or cyclic loadings deform laterally with increasing of the settlement of structure. In addition, the characteristics of ground deformation vary from hardening to softening behavior, in particular, under the cyclic condition. Based on the test results, a technique of analysis for lateral deformation based on th..., 専修大学北海道短期大学, Japanese

Lateral flow deformation evaluation of ground-structure system under various cyclic loading conditions
Proceedings of Fourth International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics (CD-ROM), 628, 2001

An Evaluation Method for Stability of Coastal Structure-Ground System subjected to Wave Force
Proceedings of International Conference on Engineering for Ocean and Offshore Structure and Coastal Engineering Development, 78, 85, 2001

Deformation Analysis of Sand Ground-Structure System Subjected to Static and Cyclic Loadings
YOKOHAMA Shoji; KAWAMURA Shima; MIURA Seiichi, Doboku Gakkai Ronbunshuu A, 3, 513, 520, 2000
This study aims to clarify analytically mechanical behaviors of a sand-structure system subjected to static and cyclic loadings.In particular, the settlement-lateral deformation behaviors of the ground bearing a structure are focused.A series of FEM analysis based on Mohr-Coulomb formulas with non-associated flow rule was carried out to accomplish the purpose.The analysis results obtained were detailedly compared with those of the model static and cyclic tests performed on the two-dimensional soil box.On the basis of these results, the applicability of FEM analysis to evaluate the deformation behaviors of the ground-structure system was made clear., Japan Society of Civil Engineers, Japanese

静的および繰返し載荷条件にある構造物・地盤系のFEM変形解析
横浜 勝司; 川村 志麻; 三浦 清一, 環境科学研究所報告, 7, 187, 195, 2000
専修大学北海道短期大学, Japanese

波浪場にある消波構造物を支持する砂地盤の流動特性とその防止に関する研究
三浦 清一; 横浜 勝司; 川村 志麻; 田中 則男, 海岸工学論文集, 44, 921, 925, 1997
Japan Society of Civil Engineers, Japanese

消波構造物・地盤系の破壊とその評価に関する実験的研究
川村 志麻; 三浦 清一; 横浜 勝司, 海岸工学論文集, 44, 936, 940, 1997
Japan Society of Civil Engineers, Japanese

消波構造物・地盤系の破壊とその評価に関する実験的研究
川村 志麻; 三浦 清一; 横浜 勝司, 海岸工学論文集, 44, 936, 940, 1997
土木学会, Japanese

Cyclic mechanical properties of sandy soils by mixing recycled asphalt pavement material
YOKOHAMA Shoji; SATO Astuko
8th international conference on Geotechnique, Construction Material and Environment (GEOMATE2018), 21 Nov. 2018, English, Poster presentation
[International presentation]

土質力学演習Ⅰ, 2024年, 学士課程, 工学部

応用数学演習Ⅰ, 2024年, 学士課程, 工学部

土木工学創成実験Ⅱ, 2024年, 学士課程, 工学部

土質力学演習Ⅱ, 2024年, 学士課程, 工学部

平成20年(2008年)岩手・宮城内陸地震現地調査
2008

平成19年(2007年)新潟県中越沖地震現地調査
2007

地盤防災・コジェネレーション・廃材リサイクルのトータルソリューションシステム
科学研究費補助金（基盤C）
Apr. 2018 - Mar. 2021
横濱 勝司
Principal investigator, Competitive research funding

Stability evaluation of volcanic slopes in cold regions
Grants-in-Aid for Scientific Research
01 Apr. 2011 - 31 Mar. 2014
MIURA SEIICHI; ISHIKAWA Tatsuya; KAWAMURA Shima; YOKOHAMA Shoji
The aim of this study is to reveal the failure mechanism of volcanic slopes in cold regions and to propose a prediction method on failure. To achieve the purposes, full-scale embankments were constructed under several conditions in Sapporo, Japan. A typical volcanic soil in the field was adopted as a soil material. After construction of embankments, changes in soil moisture, temperature, pore water pressure were investigated using devices such as soil moisture meters, etc. Simultaneously, a series of model tests was performed on small size slopes formed by the same material as that in the field to compare with the mechanical behavior of embankments. A series of triaxial tests was also conducted on compacted volcanic soils subjected to freeze-thaw cycles using a new apparatus. As a result, a reasonable prediction method of failure was proposed based on changes in water content, and its validity was confirmed.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 23241056

Sophistication of evaluation method for the long-term performance of granular base course subjected to freeze-thaw history in cold regions
Grants-in-Aid for Scientific Research
2008 - 2010
ISHIKAWA Tatsuya; MIURA Seiichi; YOKOHAMA Shouji; KAMEYAMA Shuichi; YAMASHITA Satoshi; ONO Takashi; ABE Ryuji; SEKINE Etsuo; HACHIYA Yoshitaka
In this study, we proposed new testing methods for the evaluation of the deformation-strength characteristics of base course materials subjected to freeze-thaw action, and examined the mechanical behavior of granular base before and after freeze-thawing and under freezing. We also evaluated the influences of the change in the performance of granular base due to freeze-thawing on the fatigue breaking of pavements in cold regions by applying the theoretical design method for asphalt pavement. As the result, it was revealed that the freeze-thawing of granular base has a strong influence on the fatigue life of pavement structure in cold regions because it varies the deformation-strength characteristics of base course materials.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 20360206

Immobilization of soil contaminated by heavy metal and advancement of use of immobilized soil as construction material
Grants-in-Aid for Scientific Research
2008 - 2009
YOKOHAMA Shoji
In order to investigate characteristics of mechanical behavior of immobilized soil contaminated by lead and hexavalent chromium. In this study, a volcanic product is use as a material of the immobilization of polluted soil. From the test results, it is found that admixture of the volcanic product and polluted soil brings in secure immobilization. On the other hand, it is pointed out that a possibility for strength reduction of immobilized soil by using present technique is exits.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, 20760310

Establishment of the system for the risk evaluation of geohazards at volcanic soil slope in cold regions
Grants-in-Aid for Scientific Research
2007 - 2009
MIURA Seiichi; AKAGAWA Satoshi; ISHIKAWA Tatsuya; YOKOHAMA Shoji; KAWAMURA Shima; IWAHANA Go; ITOU Yoshihiko; NISHIMOTO Satoshi
We elucidated the interaction between various factors which caused subsurface failure of volcanic soil ground subjected to freeze-thaw action in cold regions in terms of soil mechanics, and we proposed a new simple prediction method for the rain-induced slope failure in snow-melting seasons in consideration of the degradation of deformation-strength characteristics of geomaterials due to freeze-thawing. We also developed a geo-information database which integrated the various different kinds of information such as weather reports, geotechnical information, and records for past geohazards. Based on these achievements, finally, we developed the system which could evaluate a risk of rain-induced slope failure at subsurface layers suffered from freeze-thaw by using both above-mentioned prediction method and geo-information database.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 19201035

種々の地盤材料の力学特性に及ぼす締固め条件の違いの影響に関する研究
2009
Competitive research funding

Study on Elucidation and Prediction of Mechanical Behavior of Saturated/Unsaturated Granular Base Subjected to Cyclic Moving Loads.
Grants-in-Aid for Scientific Research
2006 - 2007
ISHIKAWA Tatsuya; MIURA Seiichi; YOKOHAMA Shoji; SEKINE Etsuo
This study examines the mechanical behavior of granular materials under saturated and unsaturated conditions subjected to cyclic moving loads, for example gravel roadbed and railroad ballast, and both a new testing methods and new analytical procedure to examine the effects of the rotation of principal stress axes and water content on cyclic plastic deformation of granular base course materials are proposed. The following conclusions can be obtained;
1. Two types of small scale model tests which adopted a fixed-place loading method and a moving loading method were performed with a base course material under air-dried condition and saturated condition. As the results, it was revealed that the water content of the base course material influences the mechanical behavior of granular base strongly, and the effect on the development of residual settlement for granular base under cyclic loading remarkably comes to the surface in employing moving loads.
2. Two types of multi-ring shear tests, which can consider a change in direction of principal stresses like traffic loads, were performed in the same way as loading methods in small scale model tests. As the results, it was revealed that the shear strength decreased and the cumulative residual strain increased due to the saturation, and that the mechanical behavior in multi-ring shear tests is very similar to that in small scale model tests, regardless of loading methods and water contents.
3. A new method to estimate cyclic plastic deformation of granular base under repeated wheel traveling in terms of the strength and deformation characteristics of granular base course materials was proposed. The simple analytical procedure with linear elastic FE analysis considering the cumulative strain derived from multi-ring shear test results of base course materials can roughly estimate the residual settlement of granular base under saturated and unsaturated conditions subjected to cyclic moving loads.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 18560479

Slope failure mechanism for crushable volcanic soi I at snowy cold region and its modeling
Grants-in-Aid for Scientific Research
2004 - 2006
MIURA Seiichi; AKAGAWA Satoshi; ISHIKAWA Tatsuya; YOKOHAMA Shoji; KAWAMURA Shima
Based on the experimental and numerical studies of slope stability of crushable soils, the following conclusions are obtained:
1.Effect of freeze-thaw sequence on static mechanical behavior of volcanic soil
(1)Particle breakage of volcanic coarse-grained soil significantly occurs due to the repetition of freeze-thaw sequence. The particle breakage affects strongly on static strength and rigidity of volcanic soil.
(2)Volcanic soil subjected to freeze-thaw sequences may produce a remarkable crushability at low confining pressure level. This fact suggests that deterioration in the stability of slope near the surface is significant on snowy cold region.
2.Effect of freeze-thaw sequence on dynamic mechanical behavior of volcanic soil
(1)Shear modulus of volcanic coarse-grained soil decreases due to freeze-thaw sequences. On the other hand, freeze-thaw action may less affect hysteresis damping ratio.
(2)Liquefaction resistance of volcanic soil decreased due to freeze-thaw sequences. This fact may attribute the reduction of the liquefaction resistance to the increase in finer content induced by particle breakage during freeze-thaw sequences.
3.Rainfall-induced slope collapse for crushable volcanic soil and its evaluation
(1)From the results of model tests, it is found that excess pore water pressure and saturation degree play a key role in the slope failure induced by rainfall.
(2)Depth and shape of impermeable layer in the slope are critical to estimate the stability of slope.
4.Numerical analysis for rainfall-induced slope failure for crushable volcanic soil
(1)A series of numerical analysis by DEM showed that proposed small void elements between soil particles, which are able to expand in accordance with temperature depression, can simulate the mechanical freeze-thaw performance of granular materials.
(2)Discontinuous Deformation Analysis (DDA) could explain the slope failure mechanism if rainfall and dilatancy effects on volcanic soil are estimated appropriately into analysis algorithm.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 16310121

有害重金属を含む地盤の合理的不溶化法と力学特性に関する研究
2006
Competitive research funding

Development of Element tests for elucidating mechanical behavior of granular materials subjected to cyclic moving loads
Grants-in-Aid for Scientific Research
2003 - 2004
ISHIKAWA Tatsuya; MIURA Seiichi; YOKOHAMA Shoji; SEKINE Etsuo
This study examines the mechanical behavior of granular materials subjected to cyclic moving loads, for example gravel roadbed and railroad ballast, and both a new testing method and new analytical procedures to examine the effects of the rotation of principal stress axes on cyclic plastic deformation of granular materials are proposed. The following conclusions can be obtained ;
1.Cyclic plastic deformation obtained through moving loading tests is much larger than those obtained through fixed-place cyclic loading tests when other experimental conditions are the same. Accordingly, the difference in loading methods has a significant influence on the cyclic plastic deformation of granular materials.
2.Residual strain obtained through cyclic loading triaxial tests with constant amplitude of deviator stress while controlling confining pressure constant is very small compared with the macro residual strain calculated from force-displacement relationships in moving loading tests, while that of cyclic torsional simple shear tests using a newly developed "Multi-ring shear apparatus" is almost equivalent to moving loading tests. Therefore, the multi-ring shear test is appropriate for an element test to simulate the actual stress states inside substructures under traffic loads. Moreover, it was revealed that the rotation of principal stress axes has a significant effect on cyclic deformation characteristics of granular materials.
3.Two analytical procedures for simulating the mechanical behavior of granular materials subjected to cyclic moving loads were proposed. One is linear elastic FE analysis considering the material properties of cumulative strain derived from element test results of granular materials, which can roughly estimate the residual settlement of granular substructures due to cyclic loading. The other is discontinuous analysis which elements imitate the shape of real gram particles well because it was revealed that the element shape is one of the dominant factors to determine the mechanical behavior of granular assemblage in discontinuous analysis.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, 15560420