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Affiliation Department |
社会工学科 環境都市分野
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Title |
Associate Professor |
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Contact information |
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Homepage |
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External Link |
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KYOKOWA Hiroyuki
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Research Interests
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Constitutive model
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Geomaterials
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Expansive soil
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Numerical simulation
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Element test
Research Areas
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Civil engineering material, execution and construction management
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Geotechnical engineering
From School
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Nagoya Institute of Technology Graduate School Architecture & Civil Engineering Graduated
2008.04 - 2011.03
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Nagoya Institute of Technology Graduate School Architecture & Civil Engineering Graduated
2006.04 - 2008.03
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Nagoya Institute of Technology Department of Civil Engineering Graduated
2002.04 - 2006.03
External Career
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Nagoya Institute of Technology Graduate School of Engineering Nagare College Associate Professor
2022.09
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The University of Tokyo The Graduate School of Engineering Department of Civil Engineering Assistant Professor (Lecturer)
2022.01 - 2022.08
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The University of Tokyo Department of Civil Engineering, Faculty of Engineering Assistant Professor
2017.02 - 2021.12
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KAJIMA CORPORATION Advanced Analysis Department, Civil Engineering Design Division
2014.04 - 2017.01
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Norwegian University of Science and Technology Visiting Researcher
2013.03 - 2013.10
Professional Memberships
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Japanese Society of Civil Engineering
2007.04
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Japanese Geotechnical Society
2006.04
Papers
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Fundamental investigations of oxidation method of mud-rock containing pyrite Reviewed
2024.08
Language：Japanese Publishing type：Research paper (conference, symposium, etc.)
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Liquefaction behaviour of aluminium and plastic rod assemblies using bi-axial apparatus with application of image analysis Reviewed International coauthorship
Rawiwan Sukhumkitcharoen, Junichi Koseki, Hiroyuki Kyokawa, Masahide Otsubo
E3S Web of Conferences 544 10002 - 10002 2024.07
Language：English Publishing type：Research paper (international conference proceedings) Publisher：EDP Sciences
It has recently been shown that the overall deformation characteristics of granular materials during liquefaction seems to be governed by local void ratio characteristics. The aim of this study is to investigate the relationship between mechanical properties and local void ratio changes during liquefaction in two materials of different weights (aluminium-type and plastic-type rod assemblies). A series of constant-volume cyclic bi-axial loading tests was conducted together with the image analysis obtaining local void behaviour. The experimental results demonstrate that the first liquefaction resistance of the plastic sample is higher than the aluminium one, corresponding to its smaller initial void ratio and less contractive behaviour observed in the early stage of drained monotonic compression. However, after experiencing the first liquefaction and subsequent re-consolidation histories, a liquefiable assembly of aluminium and plastic rods both became either denser (densification) or more homogenous (homogenization) in terms of local void ratio, suggesting an increase in liquefaction resistance in the next liquefaction stage. This work also includes a preliminary analogous study using a semi-3D discrete element method (DEM) with one single layer of spherical particles to simulate the similar liquefaction behaviour observed in the laboratory tests.
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地山の堆積構造に着目したトンネルの時間遅れ変状メカニズムに関する検討 Reviewed International coauthorship
劉長建，崔瑛，京川裕之，菊本統，池田慧生
岩盤力学に関するシンポジウム講演集 50 ( 1 ) 2024.01
Language：Japanese Publishing type：Research paper (conference, symposium, etc.)
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Water and soil particle movement in unsaturated bentonite with constrained and free swelling boundaries Reviewed
Hailong Wang, Yuka Yamamoto, Hiroyuki Kyokawa, Daichi Ito, Hideo Komine
Soils and Foundations 63 ( 4 ) 101350 - 101350 2023.08
Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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Experimental investigation of local chemo-mechanical behaviour and temporal development of osmotic consolidation in expansive clay Reviewed
Misa Hiraga, Hiroyuki Kyokawa, Junichi Koseki
Canadian Geotechnical Journal 2023.05
Language：English Publishing type：Research paper (scientific journal) Publisher：CANADIAN SCIENCE PUBLISHING
A series of one-dimensional cation infiltration tests under different drainage/infiltration conditions, infiltration times, ion concentrations (Na+), and vertical stresses were performed to comprehensively understand the osmotic consolidation of bentonite. The local behaviour of the specimen was captured on a digital camera through a transparent acrylic oedometer ring by tracking the movements of the marker sands on the side of the specimen. The Na+ concentration of the pore fluid throughout the specimen was measured after the test to investigate the spatiotemporal relationships between consolidation behaviour and cation infiltration. In the initial period of infiltration, the pore water pressure measured at the undrained bottom increased. A local swelling behaviour inside the specimen was observed during osmotic consolidation. The low permeability of expansive soils obstructs osmotically induced water drainage from the interlayer space of the expansive clay mineral, especially in regions far from the drainage boundary. This transition of pore water pressure affects the local mechanical behaviour; the dissipation of pore water pressure is followed by settlement. Therefore, the process of osmotic consolidation is totally longer than that of pure mechanical consolidation.
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Liquefaction characteristics in triaxial tests under various gravity environments – DEM analyses Reviewed
Masahide Otsubo, Sanjei Chitravel, Reiko Kuwano, Hiroyuki Kyokawa, Junichi Koseki
Computers and Geotechnics 156 105245 - 105245 2023.04
Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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A new index for the strength analysis and prediction of cement-mixed soils Reviewed
Tuan A. Pham, Hiroyuki Kyokawa, Junichi Koseki, Daniel Dias
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING 27 ( 4 ) 1512 - 1534 2023.03
Language：English Publishing type：Research paper (scientific journal) Publisher：TAYLOR & FRANCIS LTD
In geotechnical projects involving soft soils, cement-mixed soils are an excellent way to improve the mechanical behaviour and engineering performance of soils. The water-to-cement ratio, cement content, and porosity are the most critical parameters impacting the strength of cement-mixed soils, but their effects are less well understood. The proportional influence of cement amount, porosity, and moisture content on cement-mixed soil strength is investigated in this research. The results showed that as the water-to-cement ratio increases, the influence of cementation and porosity on unconfined compressive strength decreases. The blended volume ratio is proposed as a new and adequate index for evaluating cement-mixed soil strength based on the experimental results. The blended volume ratio is the product of the void/cement volume ratio and the water/cement volume ratio. While the current index has not fully addressed the important effects of the water-to-cement ratio and porosity, the blended volume ratio allows describing the concurrent influences of porosity, cement amount, and water amount on the strength development. The experimental results showed that the cement-mixed soil strength is a function of the blended volume ratio. An empirical equation based on the blended volume ratio was then proposed for predicting the strength of cement-mixed soils. The validation of the proposed equation is verified by strength analysis for several different test data sets. A good agreement between measured and predicted results indicated that the proposed model is applicable to predict well the strength of cement-mixed soils.
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VERIFICATION ANALYSIS ON DYNAMIC CENTRIFUGAL MODEL TEST OF AN ABUTMENT WITH EPS BACKFILL Reviewed
Tsuyoshi NISHI, Tsuyoshi TORII, Tatsuro KUBOTA, Hiroyuki KYOKAWA, Junichi KOSEKI and Takeharu KONAMI
37 2022.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Experimental investigation of local chemo-mechanical behaviour and temporal development of osmotic consolidation in expansive clay Reviewed
Misa Hiraga, Hiroyuki Kyokawa and Junichi Koseki
Canadian Geotechnical Journal 2022.11
Language：English Publishing type：Research paper (scientific journal)
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VERIFICATION ANALYSIS ON DYNAMIC CENTRIFUGAL MODEL TEST OF AN ABUTMENT WITH EPS BACKFILL
NISHI Tsuyoshi, TORII Tsuyoshi, KUBOTA Tatsuro, KYOKAWA Hiroyuki, KOSEKI Junichi, KONAMI Takeharu
Geosynthetics Engineering Journal 37 77 - 84 2022.10
Language：Japanese Publisher：Japan Chapter of International Geosynthetics Society
According to a dynamic centrifugal model test of an abutment with EPS backfill, it has been reported a large force caused by collision of slabs acts on the abutment during an earthquake. This report presents the results of a 3-dimensional FEM analysis to confirm this phenomenon and to evaluate the effect of the force on the abutment. As a result, it was confirmed: the force acting on the abutment by the slabs is generated when the inertial force is directed to the back of the abutment; the behavior is similar to that of the past test; the effect of the action on the abutment was greater due to the inertial force than the earth pressure; and replacing the slabs with EPS partly is effective in mitigating the force acting on the abutment.
Misc
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Constitutive modeling of slaking phenomena and deformation behavior
59 599 - 606 2014
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Experimental study on the slaking phenomena and deformation behavior
59 607 - 614 2014
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地盤工学会論文賞(和文部門)を受賞して
京川 裕之, 菊本 統, 中井 照夫
60 ( 8 ) 36 - 36 2012.08
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Comprehensive modeling of the water retention curve considering the influences of suction histories, void ratio and temperature
12 343 - 352 2009
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An elasto-plastic constitutive model for unsaturated soil unified considering the relation between suction, degree of saturation and density
12 331 - 342 2009
Presentations
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HMC simulation of swelling pressure test on bentonite using the double structure model considering the surface phenomena of mineral crystal International conference
Hiroyuki Kyokawa
Clay Conference 2024 International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement 2024.11
Event date： 2024.11
Language：English Presentation type：Oral presentation (general)
Venue：Hannover Country：Germany
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Continuum modeling of expansive soil considering HMC coupled phenomena on surface of the mineral crystal and its application Invited International conference
International Workshops on Advances in Computational Mechanics (IWACOM-IV) 2024.09
Event date： 2024.09
Language：English Presentation type：Oral presentation (invited, special)
Country：Japan
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ベントナイトの膨潤性評価における遠心膨潤力試験の提案
前田 頼人
第59回地盤工学研究発表会 2024.07 公益社団法人 地盤工学会
Event date： 2024.07
Language：Japanese Presentation type：Oral presentation (general)
Venue：北海道 Country：Japan
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鉱物結晶表面現象に着目したHMC有限要素解析による膨潤圧試験の再現解析
浦田琉平
第59回地盤工学研究発表会 2024.07 公益社団法人 地盤工学会
Event date： 2024.07
Language：Japanese Presentation type：Oral presentation (general)
Venue：北海道 Country：Japan
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泥岩の結晶構造・吸着陽イオンに着目した盤ぶくれの発生要因に関する検討
近藤良文
第59回地盤工学研究発表会 2024.07 公益社団法人 地盤工学会
Event date： 2024.07
Language：Japanese Presentation type：Oral presentation (general)
Venue：北海道 Country：Japan
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管状ハロイサイト粘土鉱物の力学特性に関する検討
財満陽己
第59回地盤工学研究発表会 2024.07 公益社団法人 地盤工学会
Event date： 2024.07
Language：Japanese Presentation type：Oral presentation (general)
Venue：北海道 Country：Japan
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変状トンネル周辺から採取した泥岩の劣化特性に関する一考察 International coauthorship
劉長建
第３３回トンネル工学研究発表会 2023.11 公益社団法人 土木学会 トンネル工学委員会
Event date： 2023.11
Language：Japanese Presentation type：Oral presentation (general)
Venue：東京 Country：Japan
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Constitutive model of expansive soft rock considering cementation and swelling nature International conference
Hiroyuki Kyokawa
17th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering 2023 2023.08 the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE)
Event date： 2023.08
Language：English Presentation type：Poster presentation
Venue：Astana Country：Kazakhstan
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Influence of cation exchange on crystalline swelling and its modeling
Hiroyuki Kyokawa
2023.07
Event date： 2023.07
Language：Japanese Presentation type：Oral presentation (general)
Country：Japan
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Changes in microstructural and mechanical properties of pyritic mudstone due to H2O2 oxidation
Shotaro Hijikata
2023.07
Event date： 2023.07
Language：Japanese Presentation type：Oral presentation (general)
Country：Japan
Awards
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2024.06 公益社団法人 地盤工学会
王海龍，山本有雅，京川 裕之，伊藤大知，小峯秀雄
Award type：Honored in official journal of a scientific society, scientific journal
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令和4年度かけはし賞 受賞者
2022.10 土木学会 CAD/CAEと3Dプリンターを用いた橋梁模型製作による演習型授業～理論と実践に橋を架ける～
菊地 由佳、大野 元寛、京川 裕之、大岩 敬太、蘇 迪、高橋 佑弥、渡邉 健治
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Prize for excellent presentation in 53rd conference of Japanese Geotechnical Society
2018 Japanese Geotechnical Society
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Prize for excellent presentation in 70th conference of Japanese Society of Civil Engineering
2015 Japanese Society of Civil Engineering
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Prize for excellent presentation in 49th conference of Japanese Geotechnical Society
2014 Japanese Geotechnical Society
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Best Research Paper Award
2012 Japanese Geotechnical Society Description of stress-induced anisotropy of soils by modified stress within an Isotropic hardening elastoplastic model
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Prize for excellent presentation in 46th conference of Japanese Geotechnical Society
2011 Japanese Geotechnical Society
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Prize for excellent presentation in 42nd conference of Japanese Geotechnical Society
2007 Japanese Geotechnical Society
Scientific Research Funds Acquisition Results
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オゾンによる地盤の酸化促進実験と反応予測マルチフィジックス解析
Grant number：23K17771 2023.06 - 2026.03
日本学術振興会 科学研究費助成事業 挑戦的研究(萌芽)
京川 裕之
Grant amount：\6240000 （ Direct Cost: \4800000 、 Indirect Cost：\1440000 ）
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膨張性地山におけるトンネル・切土の乾湿・水質変化に伴う進行性変状メカニズムの解明
Grant number：22H01584 2022.04 - 2025.03
日本学術振興会 科学研究費助成事業 基盤研究(B) 基盤研究(B)
京川 裕之
Grant amount：\17680000 （ Direct Cost: \13600000 、 Indirect Cost：\4080000 ）
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乾湿に伴うコンクリート中の低結晶性水和物の結晶構造の変化の解明
Grant number：22H01637 2022.04 - 2025.03
日本学術振興会 科学研究費助成事業 基盤研究(B) 基盤研究(B)
五十嵐 豪
Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）
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Measurement of shear properties of granular media under extremely low confining stress states aiming at drastic innovation of modelling of liquefaction characteristics of sands
Grant number：20K20538 2020.07 - 2023.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Challenging Research (Pioneering) Challenging Research (Pioneering)
Grant amount：\25740000 （ Direct Cost: \19800000 、 Indirect Cost：\5940000 ）
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Simulation of the life of embankments from the construction process through the long-term in-service period to deformation and failure
Grant number：19H00780 2019.04 - 2023.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)
Grant amount：\45760000 （ Direct Cost: \35200000 、 Indirect Cost：\10560000 ）
Other External Funds
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酸化による内部微細構造変化に着目した泥岩のマルチスケール力学理論の構築
2024.04 - 2025.03
公益財団法人 日比科学技術振興財団 2024年度研究助成金 特別課題
京川裕之
Authorship：Principal investigator Grant type：Competitive
Grant amount：\3000000 （ Direct Cost: \2910000 、 Indirect Cost：\90000 ）
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泥岩の酸化反応および微細構造変化に基づくマルチフィジックス理論の構築
2024.04 - 2025.03
公益財団法人 土科学センター財団 2024年度研究助成
京川裕之
Authorship：Principal investigator Grant type：Competitive
Grant amount：\1000000 （ Direct Cost: \997000 、 Indirect Cost：\3000 ）
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2023.04 - 2024.03
（一社）中部地域づくり協会 令和5年度 中部地域づくり協会研究助成事業
Authorship：Principal investigator Grant type：Competitive
Grant amount：\996000 （ Direct Cost: \996000 ）
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粘土鉱物の結晶表面現象に着目した膨張性地山の盤ぶくれメカニズムの解明
2021.04 - 2022.03
一般社団法人 上田記念財団 上田記念財団助成
京川裕之
Grant amount：\2000000 （ Direct Cost: \1840000 、 Indirect Cost：\160000 ）
Past of Cooperative Research
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膨潤性粘土鉱物を含む地盤の盤ぶくれ判断に関する検討
2023.10 - 2024.09
中日本高速道路株式会社 Collaboration in Japan
京川裕之
Authorship：Principal investigator
Grant amount：\1417000 （ Direct Cost: \1090000 、 Indirect Cost：\327000 ）
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廃棄物処分施設を対象にしたベントナイトの解析技術の開発
2023.04 - 2025.03
鹿島建設株式会社 Collaboration in Japan
Authorship：Principal investigator Grant type：Collaborative (industry/university)
Grant amount：\4000000 （ Direct Cost: \3076920 、 Indirect Cost：\923080 ）
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不飽和ベントナイトの解析技術の開発
2021.06 - 2024.03
鹿島建設株式会社 Collaboration in Japan
京川裕之
Authorship：Principal investigator Grant type：Collaborative (industry/university)
Grant amount：\4500000 （ Direct Cost: \3150000 、 Indirect Cost：\1350000 ）
Committee Memberships
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公益社団法人地盤工学会中部支部 シンポジウム部会 会員
2024.04
Committee type：Academic society
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公益社団法人地盤工学会中部支部 若手技術者の会 会員
2023.04
Committee type：Academic society
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中日本高速道路株式会社 のり面委員会 委員
2023.04
Committee type：Other
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公益社団法人地盤工学会中部支部 セミナー部会 会員
2023.04
Committee type：Academic society
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公益社団法人地盤工学会中部支部 企画委員会 委員
2023.04
Committee type：Academic society
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公益社団法人土木学会 土木学会論文集編集委員会（部門C小委員会）委員
2018.06 - 2020.05
Committee type：Academic society
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公益社団法人土木学会 Puebla地震（Mexico）による被害調査（土木学会地震工学委員会・地盤被害調査小委員会）
2017
Committee type：Academic society
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公益社団法人地盤工学会 地盤工学会誌編集委員会委員
2014.06 - 2016.05
Committee type：Academic society
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公益社団法人地盤工学会 アカデミックロードマップと発展史・人物史」の委員会（数値解析・構成式）委員
2012.04 - 2014.03
Committee type：Academic society
Academic Activities
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Nominated Member in Technical Committee on Energy Geotechnics (TC308) International contribution
Role(s)： Planning, management, etc.
International Society for Soil Mechanics and Geotechnical Engineering 2023.06
Type：Academic society, research group, etc.
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Editorial board, Soils and Foundations International contribution
Role(s)： Review, evaluation
Japanese Geotechnical Society 2023.06
Type：Editing Academic Journal