Hiroyuki Kyokawa／京川 裕之

Assistant Professor (Lecturer) in Department of Civil Engineering／講師（社会基盤学専攻）
Research Interests: Geotechnical Engineering, Soil Mechanics, Constitutive Modeling, Numerical Simulation, Multiphase response of porous media (Poster)
研究テーマ：地盤工学，土質力学，構成モデル，数値解析，地盤の多相連成挙動（ポスター）

Connect

The University of Tokyo
B39, B1F, Faculty of Engineering Building 1,
7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, JAPAN
Telephone: +81.3.5841.6137
Email: kyokawa(atmark)civil.t.u-tokyo.ac.jp

Education

  • D.Eng in Nagoya Institute of Technology in Japan, (04/2008-03/2011)
    Thesis title: Elastoplastic constitutive model for saturated and unsaturated soils considering the deposited structure and anisotropy
    Advisor: Teruo Nakai
  • M.Eng in Nagoya Institute of Technology in Japan, (04/2006-03/2008)
  • B.Eng in Nagoya Institute of Technology in Japan, (04/2002-03/2006)

Work experience

01/04/2008 – 31/03/2011         JSPS Doctoral course Fellow, Nagoya Institute of Technology, Japan
01/04/2011 – 31/03/2014         JSPS Postdoctoral Fellow, The University of Tokyo, Japan
(01/03/2013 – 18/09/2013)      Visiting Researcher, Norwegian University of Science and Technology, Norway
01/04/2014 – 31/01/2017         Member of Geotechnical Analysis Group, Advanced Analysis Department, Civil Engineering Design Division, KAJIMA CORPORATION
01/02/2017 – 31/12/2021          Assistant Professor, Department of Civil Engineering, Faculty of Engineering, The University of Tokyo
01/01/2022 – present                 Assistant Professor (Lecturer), Department of Civil Engineering, Faculty of Engineering, The University of Tokyo

List of Publications

  1. Kyokawa, H., Kikumoto, M., Nakai, T. and Shahin, H. M. : An elasto-plastic constitutive model for unsaturated soil unified considering the relation between suction, degree of saturation and density, Journal of Applied Mechanics, JSCE, Vol. 12, pp.331-342, 2009. (in Japanese)
  2. Kikumoto, M., Kyokawa, H. and Nakai, T. : Comprehensive modeling of the water retention curve considering the influences of suction histories, void ratio and temperature, Journal of Applied Mechanics, JSCE, Vol. 12, pp.343-352, 2009. (in Japanese)
  3. Nakai, T., M., Shahin, H. M., Kikumoto, Kyokawa, H. and Zhang, F. : Simple and unified method for describing various characteristics of geomaterials – Influences of density, bonding, time effects and others, Journal of Applied Mechanics, JSCE, Vol. 12, pp.371-382, 2009. (in Japanese)
  4. Kyokawa, H., Kikumoto, M. and Nakai, T. : Description of stress-induced anisotropy of soils by modified stress within an Isotropic hardening elastoplastic model, Japanese Geotechnical Journal, Vol. 5, No.4., pp.533-544, 2010. (in Japanese)
  5. Nakai, T., Shahin, H. M., Kikumoto, M., Kyokawa, H., Zhang, F. and Farias, M. M. : A simple and unified one-dimensional model to describe various characteristics of soils, Soils and Foundations, vol. 51, no. 6, pp.1129-1148, 2011.
  6. Nakai, T., Shahin, H. M., Kikumoto, M., Kyokawa, H., Zhang, F. and Farias, M. M. : A simple and unified three-dimensional model to describe various characteristics of soils, Soils and Foundations, vol. 51, no. 6, pp.1149-1168, 2011
  7. Kazmi, Z. A., Konagai, K., Kyokawa, H. and Tetik, C. : Surface rupture of the normal seismic faults and slope failures appeared in April 11th, 2011 Fukushima-Prefecture Hamadoori Earthquake, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) , 68(4), I_1285-I_1292, 2012
  8. Aglipay, M. R., Konagai, K., Kyokawa, H. and Keshab, S. : Road bridges in Minami-Sanriku washed away in the March 11th 2011 Great East Japan Earthquake and Tsunami, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 67(4), I_1307-I_1314, 2012.
  9. Kyokawa H., Kiyota, T., Kondo, Y. and Konagai, K. : Survey report on Liquefaction-induced damage in Urayasu city caused by The 2011 of the Pacific coast of Tohoku Earthquake, Japanese Geotechnical Journal, 7(1), 265-273, 2012. (in Japanese)
  10. Aglipay, R., Konagai, K., Kiyota, T. and Kyokawa, H. : Simple Formulation of the Ultimate Lateral Resistance of Single Piles on Sand based on Active Pile Length, JSCE Journal of Earthquake Engineering, Vol. 71, No. 4 p. I_329-336, 2015.
  11. Suyama, S., Kiyota, T., Konagai, K., Kyokawa, H., Uemura, K. and Hamanaka, R. : Identification of factors affecting liquefaction-induced road subsidence in Urayasu city extracted from digital surface models, Journal of Japan Society of Civil Engineers, C, Vol. 72, No. 1, pp. 38-47, 2016.
  12. Hirano, T., Ohtani, Y., Kyokawa, H., Mihara, M., Shimizu, H. and Honda, A. : Crack formation in cementitious materials used for an engineering barrier system and their impact on hydraulic conductivity from the viewpoint of performance assessment of a TRU Waste disposal system, Transactions of the Atomic Energy Society of Japan, Vol. 15, No. 2, pp. 97-114, 2016.
  13. Kikumoto, M., Fukuda, T. and Kyokawa, H. : Slaking phenomena and deformation behavior of crushed mudstone，Journal of Japan Society of Civil Engineers, C，Vol. 72, No. 2, pp. 126-135, 2016.
  14. Kiyota, T., Ikeda, T., Yokoyama, Y. and Kyokawa, H. : Effect of in-situ sample quality on undrained cyclic strength and liquefaction assessment, Soils and Foundations, 56, No. 4, pp. 691-703, 2016.
  15. Bekele Y.W., Kyokawa, H., Kvariving, A. M., Kvamsdal, T. and Nordal, S. : Isogeometric Analysis of THM Coupled Processes in Ground Freezing, Computers and Geotechnics, Vol. 88, pp. 129-145, 2017.
  16. Kiyota, T., Keshab, S. and Kyokawa, H. : Effect of slaking on direct shear behaviour of crushed mudstones, Soils and Foundations , Vol.57, No. 2, pp. 288-300, 2017.
  17. Mihara, M., Hirano, T., Takayama, Y., Kyokawa, H. and Ohno, S.: Long-term mechanical analysis code considering chemical alteration for a TRU waste geological repository, Journal of Nuclear Fuel Cycle and Environment, Vol. 24, No. 1, pp. 15-26, 2017.
  18. Alberto, Y., Kyokawa, H., Otsubo, M., Kiyota, T. and Towhata, I.: Reconnaissance of the 2017 Central Mexico Earthquake, JSCE Journal of Disaster FactSheets, FS2018-E-0001, 2018.
  19. Alberto, Y., Otsubo, M., Kyokawa, H., Kiyota, T. and Towhata, I.: Reconnaissance of the 2017 Puebla, Mexico earthquake, Soils and Foundations, Vol. 58, No. 5, pp. 1073-1092, 2018.
  20. Kyokawa, H., Yamazaki, Y., Koseki, J., Konami, T., Nishi, T. and Kubota, T.: Shaking table tests on combined use of EPS block and geogrid to improve seismic stability of retaining walls, Geosynthetics Engineering Journal, Vol. 33, pp. 197-204, 2018. (in Japanese)
  21. Nishi, T., Tani, H., Hayashi, N., Konami, T., Koseki, J., Kyokawa, H., Yasuhara, K., Kubota, T. and Tsukamoto, H.: Behavior of the EPS embankments reinforced by the new joint metal binder under earthquakes, Geosynthetics Engineering Journal, Vol. 33, pp. 197-204, 2018. (in Japanese)
  22. Kyokawa, H., Kawasaki, H., Koseki, J., Konami, T., Nishi, T. and Kubota, T.: Shaking table tests on combined use of EPS block and geogrid to imporve seismic stability of abutments, Geosynthetics Engineering Journal, Vol. 34, pp. 161-168, 2019. (in Japanese)
  23. Nishi, T., Tani, H., Hayashi, N., Kubota, T., Kyokawa, H., Koseki, J. and Konami, T.: Evaluation of the effect of the new type joint metal and countermeasures against rocking by full scale shaking table tests of EDO-EPS embankment, Geosynthetics Engineering Journal, Vol. 34, pp. 153-160, 2019. (in Japanese)
  24. Kyokawa, H., Ohno, S. and Kobayashi, I.: A method for extending a general constitutive model to consider the electro‐chemo‐mechanical phenomena of mineral crystals in expansive soils, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 44, pp. 749-771, 2020.
  25. Maqsood, Z., Koseki, J., Ahsan, Md.M., Shaikh, M. and Kyokawa, H.: Experimental study on hardening characteristics and loading rate dependent mechanical behaviour of gypsum mixed sand, Construction and Building Materials, Vol. 262, 119992, 2020.
  26. Maqsood, Z., Koseki, J., Miyashita, Y., Xie, J. and Kyokawa, H.: Experimental study on the mechanical behaviour of bounded geomaterials under creep and cyclic loading considering effects of instantaneous strain rates, Engineering Geology, Vol. 276, 2020.
  27. Kyokawa, H., Maqsood Z. and Koseki, J.: Influences of strain history and time period of creep after unloading on strength and deformation characteristics of expanded polypropylene block, Geosynthetics Engineering Journal, Vol. 35, pp. 103-108, 2020. (in Japanese)
  28. Kyokawa, H., Yamazaki, Y., Koseki, J., Konami, T., Nishi, T. and Kubota, T.: Shaking table tests on bridge abutment reinforced by EPS and geogrid, Geosynthetics International, special issue on 12ICG, 2021.
  29. Shaikh, M., Kyokawa, H., Maqsood, Z., Ahsan, Md. K. and Koseki, J.: Mechanical behaviour and loading rate dependency of gypsum mixed fine-grained soils under uniaxial loading, Proceeding of the Institution of Civil Engineers – Geotechnical Engineering, 2021.
  30. Kyokawa, H.: A double structure model for hydro-mechano-chemical behavior of expansive soils based on the surface phenomena of mineral crystals, Engineering Geology, Vol. 294, 2021.
  31. Nishi, T., Torii, T., Hayashi, Kubota, T., Kyokawa, H., Koseki, J. and Konami, T.: Seismic earth pressures affected by the slab installed on the EPS embankment in the back side of abutment and mitigation measure, Geosynthetics Engineering Journal, Vol. 36, 2021.  (in Japanese)
  32. Komolvilas, V., Kikumoto, M. and Kyokawa, H.: Mechanism of wetting–induced deformation and failure of unsaturated soils, International Journal for Numerical and Analytical Methods in Geomechanics, 2022.
  33. Pham, A. T., Kyokawa, H., Koseki, J. and Dias, D.: A new index for the strength analysis and prediction of cement-mixed soils, European Journal of Environmental and Civil Engineering, 2022.
  34. Otsubo, M., Chitravel, S., Kuwano, R., Hanley, K. J., Kyokawa, H. and Koseki, J.: Linking inherent anisotropy with liquefaction phenomena of granular materials by means of DEM analysis, Soils and Foundations, Vol. 62, No. 5, 2022.
  1. Kikumoto, M., Nakai, T., Zhang, F., Hinokio, M., Yagyu, A. and Kyokawa, H.：An elastoplastic model for soil considering soil structure,  of the international symposium on Plasticity 2006, Halifax, Canada, CD-ROM, 2006.
  2. Kikumoto, M., Nakai, T., Zhang, F., Hinokio, M., Yagyu, A. and Kyokawa, H.：Extension of subloading tijmodel to structured soils,  of the International symposium on Geomechanics and Geotechnics of Particulate Media (IS-Yamaguchi 06), Yamaguchi, Japan, pp.305-311, 2006.
  3. Kikumoto, M., Nakai, T., Zhang, F., Hinokio, M., Yagyu, A. and Kyokawa, H.：An isotropic hardening model for induced anisotropy, of the 3rd international workshop in Computational Geotechnics, Xi’an, China, pp.115-120, 2006.
  4. Kikumoto, M., Nakai, T., Zhang, F., Hinokio, M. and Kyokawa, H.：Expression of induced anisotropy of soils using isotropic hardening rule in modified stress space, of the International conference on Numerical Models in Geomechanics (NUMOG X), Rhodes, Greece, pp.85-91, 2007.
  5. Kikumoto, H. Kyokawa, T. Nakai, F. Zhang and M. Hinokio：Isotropic hardening model for soils considering stress-induced anisotropy, Proc. of the 3rd Sino-Japan Geotechnical Symposium, pp.278-289, 2007.
  6. Nakai, F. Zhang, H. Kyokawa and M. Kikumoto：A simple modeling of structured soils,Proc. of the 3rd Sino-Japan Geotechnical Symposium, pp.435-447, 2007.
  7. Kikumoto, M. Hinokio, A. Yagyu, H. Kyokawa and C. Seya：Development of subloading tijmodel considering soil structure, Proc. of the 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, pp.1093-1096, 2007.
  8. Kyokawa, T. Nakai, F. Zhang and M. Kikumoto：A method of modeling of geomaterials considering density and bonding of soils,Proc. of APCOM ‘07 in conjunction with EPMESC XI, MS29-1-3, 2007.
  9. Kikumoto, M., Nakai, T., Kyokawa, H., Zhang, F. and Shahin, H. M：A unified method to describe the influence of intermediate principal stress and stress history in constitutive modeling,  of the 2nd international workshop on Geotechnics of Soft Soils Focus on Ground Improvement, Glasgow, United Kingdom, pp.151-157, 2008.
  10. Nakai, T., Zhang, F., Kyokawa, H., Kikumoto, M. and Shahin, H. M.：Modelling the influence of density and bonding on geomaterials,  of the 2nd international workshop on Geotechnics of Soft Soils Focus on Ground Improvement, Glasgow, United Kingdom, pp.65-76, 2008.
  11. Nakai, T., Kikumoto, M., Kyokawa, H. and Zhang, F. : A simple method to consider density and bonding effects in modeling of geomaterials, of the 8th international workshop on Bifurcations and Degradations in Geomaterials, Alberta, Canada, 2009.
  12. Nakai, T., Kyokawa, H., Kikumoto, M., Shahin, H. M. and Zhang, F. : Elastoplastic modeling of geomaterials considering the influence of density and bonding, of the international symposium on Prediction and Simulation Methods for Geohazard Mitigation, Kyoto, Japan, pp.367-374, 2009.
  13. Kikumoto, M., Nakai, T. and Kyokawa, H : New description of stress-induced anisotropy using modified stress,  of the 17th International Conf. on Soil Mechanics and Geotechnical Engineering, Alexandria, Egypt, pp.550-553, 2009.
  14. Kyokawa, H., Kikumoto, M. and Nakai, T. : Extension of the modified stress tij* to describe the induced anisotropy,  of the 4th International Workshop on New Frontiers in Computational Geotechnics (IWS-Pittsburgh), Pittsburgh, pp.13-18, 2009.
  15. Nakai, T., Kyokawa, H., Kikumoto, M., Shahin, H.M. and Feng, Z.: One-dimensional and three-dimensional descriptions of elastoplastic behavior in structured clays,  of the 4th International Workshop on New Frontiers in Computational Geotechnics (IWS-Pittsburgh), Pittsburgh, pp.3-10, 2009.
  16. Kyokawa, H., Kikumoto, M. and Nakai, T. : A simple description of stress-strain and hydraulic behaviours of unsaturated soil,  of the 4th Sino-Japan Geotechnical Symposium,Naha, pp.74-81, 2010.
  17. Shahin, H. M., Nakai, T., Kikumoto, M., Kyokawa, H. and Miyahara, Y. : Modeling of time-dependent behavior of clay in one-dimensional consolidation,  of the 4th Sino-Japan Geotechnical Symposium,Naha, pp.54-61, 2010.
  18. Nakai, T., Shahin, H. M., Kikumoto, M., Kyokawa, H. and Zhang, F. : Unified method for describing various features of stress-strain behavior of geomaterials,Invited lecture of Geoshanghai international conference 2010, Shanghai, China, pp.1-10, 2010.
  19. Kyokawa, H., Kikumoto, M., Nakai, T. and Shahin, H. M. : Simple modeling of stress-strain relation for unsaturated soil, Experimental and Applied Modeling of Unsaturated Soils (Geotechnical Special Publication No.202), American Society of Civil Engineers, Shanghai, China, pp.17-25, 2010.
  20. Kikumoto, M., Kyokawa, H., Nakai, T. and Shahin, H. M. : A simple elasto-plastic model for unsaturated soils and interpretations of collapse and compaction behaviours, of the 5th International Conf. on Unsaturated Soils (UNSAT 2010), Barcelona, Spain, pp.849-855, 2010.
  21. Kikumoto, M., Kyokawa, H., Nakai, T., Shahin, H. M., Tatematsu, K. and Koike, M. : Mechanical interpretation of compaction behaviour by an elastoplastic model for unsaturated soils, of the Bangradesh geotechnical conference 2010 on Natural Hazards and Countermeasures in Geotechnical Engineering, Dhaka, Bangradesh, pp.121-128, 2010.
  22. Nakai, T., Shahin, H.M., Kikumoto, M. and Kyokawa, H. : Simple modeling of time-dependent behavior of geomaterials, of the 5th International Workshop on New Frontiers in Computational Geotechnics (IWS-Brisbane), Brisbane, pp.3-10, 2010.
  23. Kyokawa, H., Kikumoto, M., Nakai, T. and Shahin, H.M.: Simple modeling of unsaturated soil, of the 5th International Workshop on New Frontiers in Computational Geotechnics (IWS-Brisbane), Brisbane, pp.131-138, 2010.
  24. Nakai, T., Shahin, H. M., Kikumoto, M., Kyokawa, H., Zhang, F. and Farias, M.M. : New approach for modeling time-dependent behavior of geomaterials, of COMGEO II, Dubrovnik, Croatia, pp.49-62, 2011.
  25. Kikumoto, M., Kyokawa, H. and Nakai, T. : Simple modelling of stress-strain behaviour of unsaturated soils, of 14th Asian Regional conf. on Soil Mechanics and Geotechnical Engineering, Hong Kong, China, 6 pages in CD-ROM, 2011.
  26. Nakai T., Shahin H.M., Kyokawa H. and Miyahara Y. : Modeling of one-dimensional consolidation behavior for clays, of 14th ARCSMGE, Hong Kong, CD-ROM, 2011.
  27. Nakai, T., Kikumoto, M., Kyokawa, H. and Zhang, F. : A simple method to consider density and bonding effects in modeling of geomaterials, of the 8th international workshop on Bifurcations and Degradations in Geomaterials, Alberta, Canada, pp.91-111, 2011
  28. Kyokawa, H., Konagai, K., Kiyota, T., Katagiri, T. and Kazmi, Z. A. : LiDAR measurement of the breached earth-fill dam in the March 11th Great East Japan Earthquake, of International Symposium on Engineering Lessons Learned from the Giant Earthquake (One year after the 2011 Great East Japan Earthquake), Tokyo, Japan, CR-ROM, 2012.
  29. Konagai, K., Asakura, T., Suyama, S., Kyokawa, H., Kiyota, T., Eto, C. and Shibuya, K. : Soil subsidence map of the Tokyo Bay area liquefied in the March 11th Great East Japan Earthquake, of International Symposium on Engineering Lessons Learned from the Giant Earthquake (One year after the 2011 Great East Japan Earthquake), Tokyo, Japan, CD-ROM, 2012.
  30. Konagai, K., Kiyota, T., Asakura, T., Suyama, S., Kyokawa, H., Shibuya, K. and Eto, C. : Subsidence map of Tokyo bay area liquefied in the March 11th Great East Japan Earthquake, of 15th World Conference of Earthquake Engineering, Lisbon, Portugal, CR-ROM, 2012.
  31. Kondo, Y., Kiyota, T. and Kyokawa, H. : Aging effect of reclaimed sandy soil on liquefaction characteristics in large strain torsional shear test, of the 5th Taiwan-Japan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfall, Tainan, Taiwan, III.7-10, 2012.
  32. Lee, J., Sharma, K., Kiyota, T., Kyokawa, H. and Takeuchi, W. : Effects of drought preceding rainfall on slaking-induced instability, of the 5th Taiwan-Japan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfall, Tainan, Taiwan, IV.21-24, 2012.
  33. Sharma, K., Kiyota, T. and Kyokawa, H. : Influence of cyclic wetting and drying on stress and deformation characteristics of crushed mudstones in direct shear test, of the 5th Taiwan-Japan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfall, Tainan, Taiwan, IV.25-28, 2012.
  34. Nakai, T., Shahin, H. M., Hinokio, M. and Kyokawa, H. : Description of tij concept in constitutive modeling of geomaterials, Of the 3rd International Symposium on Computational Geomechanics (COMGEO III), Krakow, Poland, pp.108-122, 2013.
  35. Nakai T., Shahin H. M. and Kyokawa H. : Rational expression of time-dependent behavior from normally consolidated soil to naturally deposited soil, of the 18th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE), Paris, France, pp.255-258, 2013.
  36. Kyokawa, H. and Nakai, T. : The modified stress reflecting the soil fabric and description of the induced anisotropy in an isotropic hardening elastoplastic model, of the 6th International Workshop on New Frontiers in Computational Geotechnics (IWS-Takayama), Takayama, Japan, pp. 2013.
  37. Kyokawa, H., Ohashi, R. and Nakai, T. : The rotation hardening rule without the limit surface of hardening, of the 3rd International Conference on Geotechnique, Construction materials and Environment, Nagoya, Japan, pp.95-100, 2013.
  38. Keshab, S., Kiyota, T. and Kyokawa, H. : A study on the slaking-induced creep deformation characteristics of crushed mudstones, of the 3rd International Conference on Geotechnique, Construction materials and Environment, Nagoya, Japan, pp.107-112, 2013.
  39. Asano K., Shahin H.M., Kyokawa H., Nakai T. and Ohashi, R.: Influence of the stress history on the stiffness of soil, of 3rd International Conference on Geotechnique, Construction Materials and Environment, Nagoya, Japan, pp.205-210, 2013.
  40. Aglipay, M. R., Konagai, K., Kiyota, T. and Kyokawa, H.: Ultimate Lateral Resistance of Piles in Soils based on Active Pile Length, of the 6th Japan-Taiwan Joint Workshop on Geotechnical Hazards from Large Earthquakes and Heavy Rainfall, Kitakyushu, Japan, pp. 53-54, 2014.
  41. Kyokawa, H. and Bekele, Y.W. : Numerical simulation of thermos-hydro-mechanically coupled processes during ground freezing and thawing, of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, Kyoto, Japan, USB pp.379-384, 2014.
  42. Bekele, Y.W. and Kyokawa, H.: On thermo-hydro-mechanically (THM) coupled finite element modeling of ground freezing and thawing, Proceedings of the 8th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2014, Volume 2, 2014, Pages 959-964, 2014.
  43. Aglipay, M. R., Konagai, K., Kiyota, T. and Kyokawa, H.: Simple formulation of the ultimate lateral resistance of single pile in cohesive soils based on active pile length, of the 6th International Conference on Earthquake Geotechnical Engineering, Christchurch, New Zealand, 2015.
  44. Nakai,T., Shahin, H.M. and Kyokawa, H.: Simple modeling of time-dependent behavior for normally consolidated soil and structured soils, Proc. of 49th US Rock Mechanics/Geomechanics Symposium, San Francisco, USA, USB ARMA 15-716, 2015.
  45. Okamoto, M., Obara, T., Nakajima, Y., Yoshida, T., Kitamoto, Y., Kyokawa, H., Sawada Y. and Fujisaki, K.: Effect of lattice-frame reinforced geosynthetics on seismic stability improvement of embankment on loose sand deposit, Proc. of 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Fukuoka, Japan, 2015.
  46. Kyokawa, H., Ohno, S. and Kobayashi, I.: A method to consider the electrical/chemical interaction of clay crystal in general constitutive model,  Proc. of Numerical Method in Geotechnical Engineering IX (NUMGE2018), Porto, Portugal, 2018.
  47. Koseki, J., Yamazaki, Y., Kyokawa, H., Konami, T., Nishi, T. and Kubota, T.: Shaking table tests on combined use of EPS and geogrid to improve seismic stability of bridge abutments, Proc. of the 11th International Conference on Geosynthetics, Soul, Korea, 2018.
  48. Maqsood, Z., Koseki, J. and Kyokawa, H.: Effects of loading rate on strength and deformation characteristics of gypsum mixed sand, Proc. of 7th International Symposium on Deformation Characteristics of Geomaterials, Glasgow, UK, 2019.
  49. Hiraga, M., Koseki, J. and Kyokawa, H.: Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test, Proc. of 7th International Symposium on Deformation Characteristics of Geomaterials, Glasgow, UK, 2019.
  50. Tan Tian, JU., Koseki, J., Wang, H., Kyokawa, H. and Sato, T.: A system to measure permeability of unsaturated soils using local pin-type sensors in triaxial apparatus, Proc. of 7th Asia-Pacific Conference on Unsaturated Soils, Nagoya, Japan, 2019.
  51. Kyokawa, H.: Constitutive model describing the hydro-mechanical behaviors of compacted bentonite clay based on the crystal phenomena, Proc. 2nd International Conference on Energy Geotechnics (ICEGT 2020), USA, 2020 (original)- 2022 (postponed).

Additional Qualifications, Prizes

  • Prize for excellent presentation in 42thconference of Japanese Geotechnical Society (2007)
  • Prize for excellent presentation in 46thconference of Japanese Geotechnical Society (2011)
  • Best Research Paper Award, Japanese Geotechnical Society (2012)
    Description of stress-induced anisotropy of soils by modified stress within an Isotropic hardening elastoplastic model
  • Prize for excellent presentation in 49thconference of Japanese Geotechnical Society (2014)
  • Prize for excellent presentation in 70thconference of Japanese Society of Civil Engineering (2015)
  • Prize for excellent presentation in 53thconference of Japanese Geotechnical Society (2018)
  • Prize for technological development, Japan Society of Dam Engineers (2020)
    施工中のロックフィルダム堤体挙動管理を実現するＦＥＭ情報化施工技術