Accurate measurement and modeling of properties of liquefied sandy soils under a wide range of stress and strain conditions

• Project/Area Number: 21360221
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: The University of Tokyo
• Principal Investigator: KOSEKI Junichi 東京大学, 生産技術研究所, 教授 (30272511)
• Co-Investigator(Renkei-kenkyūsha): NAMIKAWA Tsutomu 芝浦工業大学, 工学部土木工学科, 教授 (50455151) ; MIYASHITA Yukika 東京大学, 生産技術研究所, 技術職員 (20396914)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥15,470,000 (Direct Cost: ¥11,900,000、Indirect Cost: ¥3,570,000); Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2010: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2009: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
• Keywords: 土質力学 / 液状化 / 地盤工学 / 地震 / 室内土質試験 / モデル化 / 砂質土 / 大ひずみ / 中空ねじり試験 / 単純せん断試験 / 砂

Research Abstract

A series of undrained hollow cylindrical cyclic torsional shear tests with initial shear were conducted on saturated Toyoura sand to reveal the effects of initial shear on large deformation properties of liquefied sand. By extending a numerical model that had been developed to simulate the liquefaction behavior without initial shear, the test results with initial shear could be reasonably simulated. In addition, a stacked-ring simple shear test apparatus was newly constructed, and it was employed to reveal the effects of liquefaction history on re-liquefation properties.

Research Products

• [Journal Article] Strain localization characteristics of loose saturated Toyoura sand in undrained cyclic torsional shear tests with initial static shear (2013)
  • Author(s): Chiaro, G., Kiyota, T. and Koseki, J.
  • Journal Title: Soils and Foundations Volume: Vol.53, No.1 Pages: 23-34
  • Peer Reviewed
• [Journal Article] Effects of initial static shear on liquefaction and large deformation properties of loose saturated Toyoura sand in undrained cyclic torsional shear tests (2012)
  • Author(s): Chiaro, G., Koseki, J. and Sato, T.
  • Journal Title: Soils and Foundations Volume: Vol.52, No.3 Pages: 498-510
  • Peer Reviewed
• [Journal Article] Comparison of liquefaction-induced ground deformation between results from undrained cyclic torsional shear tests and observations from previous model tests and case studies (2010)
  • Author(s): Kiyota, T., Koseki, J., Sato, T.
  • Journal Title: Soils and Foundations Volume: 50(3) Pages: 155-158
  • NAID: 130004552427
  • Peer Reviewed
• [Presentation] Liquefaction and failure mechanisms of sandy sloped ground during earthquakes: a comparison between laboratory and field observations (2012)
  • Author(s): Chiaro, G. and Koseki, J.
  • Organizer: Proc. of Australian Earthquake Engineering Society 2012 Conference, Gold Coast
  • Place of Presentation: Australia
  • Year and Date: 2012-12-08
• [Presentation] An elasto-plastic model for liquefiable sands subjected to torsional shear loadings, Proc. (2012)
  • Author(s): Chiaro, G., Koseki, J. and De Silva, L.I.N.
  • Organizer: of 2nd International Symposium on Constitutive Modeling of Geomaterials
  • Place of Presentation: Beijing, China
  • Year and Date: 2012-10-16
• [Presentation] Modelling of sand behavior in drained cyclic shear, Advances in Transportation Geotechnics II, Miura et al. (eds.) (2012)
  • Author(s): DeSilva, L.I.N. and Koseki, J.
  • Organizer: CRC Press
  • Place of Presentation: 札幌
  • Year and Date: 2012-09-11
• [Presentation] Observation of shear banding behavior of sand in torsional shear test using image analysis technique, Advances in Multiphysical Testing of Soils and Shales (2012)
  • Author(s): Wahyudi, S., Miyashita, Y. and Koseki, J.
  • Organizer: Springer
  • Place of Presentation: Lausanne, Switzerland
  • Year and Date: 2012-09-04
• [Presentation] An elasto-plastic model to describe the undrained cyclic behavior of saturated sand with initial static shear, Proc. (2011)
  • Author(s): Chiaro, G., De Silva, L.I.N., Kiyota, T. and Koseki, J.
  • Organizer: International Symposium on Deformation Characteristics of Geomaterials
  • Place of Presentation: Seoul,Korea
  • Year and Date: 2011-09-01
• [Presentation] Shear band behavior of sand in torsional shear tests by means of image analysis, Proc. (2011)
  • Author(s): Wahyudi, S., Miyashita, Y. and Koseki, J.
  • Organizer: of 13th International Summer Symposium, International Activities Committee, JSCE,
  • Place of Presentation: 京都
  • Year and Date: 2011-08-26
• [Presentation] 飽和豊浦砂の非排水大ひずみ繰返しねじり せん断特性に及ぼす初期せん断の影響 (2011)
  • Author(s): 古関潤一,Chiaro, G., 佐藤剛司,清田隆
  • Organizer: 第46回地盤工学研究発表会講演概要集
  • Place of Presentation: 神戸
  • Year and Date: 2011-07-06
• [Presentation] Modelling of drained and undrained cyclic shear behavior of sand, Proc. (2011)
  • Author(s): DeSilva, L.I.N. and Koseki, J.
  • Organizer: of 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering
  • Place of Presentation: Hong Kong, China
  • Year and Date: 2011-05-25
• [Presentation] Effects of initial static shear stress on shear strain localization characteristics of sand in undrained cyclic torsional shear tests, Proc. (2011)
  • Author(s): Chiaro, G., Kiyota, T. and Koseki, J.
  • Organizer: of 8th International Conference on Urban Earthquake Engineering
  • Place of Presentation: Tokyo
  • Year and Date: 2011-03-07
• [Presentation] Effect of initial static shear stress on the undrained cyclic behavior of saturated sand by torsional shear loading, Proc. (2011)
  • Author(s): Chiaro, G., Sato, T., Kiyota, T. and Koseki, J.
  • Organizer: of 5th International Conference on Geotechnical Earthquake Engineering
  • Place of Presentation: Santiago, Chile
  • Year and Date: 2011-01-11
• [Presentation] Three-dimensional modeling of stress-strain relationship of sand subject to large cyclic loading, Proc. (2011)
  • Author(s): Namikawa, T., Koseki, J. and DeSilva, L.I.N.
  • Organizer: of 5th International Conference on Geotechnical Earthquake Engineering, Santiago
  • Place of Presentation: Chile
  • Year and Date: 2011-01-11
• [Presentation] Stress-dilatancy behavior of loose sand during drained cyclic torsional shear loading, Proc. (2010)
  • Author(s): Wahyudi, S., Chiaro, G., De Silva, L.I.N. and Koseki, J.
  • Organizer: of 12th International Summer Symposium, International Activities Committee, JSCE
  • Place of Presentation: 千葉
  • Year and Date: 2010-09-21
• [Presentation] Stress-dilatancy behavior of loose sand during drained cyclic torsional shear loading (2010)
  • Author(s): Wahyudi, S., Chiaro, G., De Silva, L.I.N., Koseki, J.
  • Organizer: Proc.of 12th International Summer Symposium, International Activities Committee, JSCE
  • Place of Presentation: 日本大学,千葉
  • Year and Date: 2010-09-21
• [Presentation] A method for assessing failure behavior of sand with initial static shear, Proc. (2010)
  • Author(s): Chiaro, G., Sato, T. and Koseki, J.
  • Organizer: of 12th International Summer Symposium, International Activities Committee, JSCE
  • Place of Presentation: 千葉
  • Year and Date: 2010-09-18
• [Presentation] A method for assessing failure behavior of sand with initial static shear (2010)
  • Author(s): Chiaro, G., Sato, T., Koseki, J.
  • Organizer: Proc.of 12th International Summer Symposium, International Activities Committee, JSCE
  • Place of Presentation: 日本大学,千葉
  • Year and Date: 2010-09-18
• [Presentation] Extremely large post-liquefaction deformations of saturated sand under cyclic torsional shear loading, Earthquake GeotechnicalEngineering Satellite Conference (2009)
  • Author(s): Chiaro, G., Kiyota, T., De Silva, L.I.N., Sato, T. and Koseki, J.
  • Organizer: 17th International Conference on Soil Mechanics and Geotechnical Engineering, Alexandria,Egypt
  • Place of Presentation: CD-ROM
  • Year and Date: 2009-10-03
• [Presentation] Behavior of saturated sand with initial static shear stress in cyclic torsional shear tests Proc. of 11th International Summer Symposium (2009)
  • Author(s): Chiaro, G., Sato, T. and Koseki, J.
  • Organizer: International Activities Committee, JSCE
  • Place of Presentation: 東京
  • Year and Date: 2009-09-11
• [Presentation] Observation of shear banding behavior of sand in torsional shear test using image analysis technique
  • Author(s): Wahyudi, S., Miyashita, Y. and Koseki, J.
  • Organizer: Advances in Multiphysical Testing of Soils and Shales
  • Place of Presentation: Lausanne, Switzerland
• [Presentation] Modelling of sand behavior in drained cyclic shear
  • Author(s): DeSilva, N.I.L. and Koseki, J.
  • Organizer: Advances in Transportation Geotechnics II
  • Place of Presentation: 札幌
• [Presentation] Liquefaction and failure mechanisms of sandy sloped ground during earthquakes: a comparison between laboratory and field observations
  • Author(s): Chiaro, G. and Koseki, J.
  • Organizer: Australian Earthquake Engineering Society 2012 Conference
  • Place of Presentation: Gold Coast, Australia
• [Presentation] An elasto-plastic model for liquefiable sands subjected to torsional shear loadings
  • Author(s): Chiaro, G., Koseki, J. and De Silva, L.I.N.
  • Organizer: 2nd International Symposium on Constitutive Modeling of Geomaterials
  • Place of Presentation: Beijing, China