Local deformation characteristics of re-liquefied soil in cyclic simple shear tests using stacked-ring

• Project/Area Number: 23760439
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geotechnical engineering
• Research Institution: The University of Tokyo
• Principal Investigator: MIYASHITA Yukika 東京大学, 生産技術研究所, 技術専門職員 (20396914)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 繰返しリング単純せん断 / 局所大変形 / 砂質土の再液状化 / 画像解析 / 中空ねじりせん断 / 三軸圧縮 / 砂質土の液状化 / 自然斜面の崩壊

Outline of Final Research Achievements

A new system was established by the combination of uniquely developed simple shear test apparatus using stacked-ring and image analysis technique with high resolution. Mechanism of re-liquefaction was investigated by focusing on local deformation characteristics during liquefaction. Change of liquefaction properties during multiple events were evaluated in a systematic way to clarify the conditions in which re-liquefaction tended to take place easily. Difference of liquefaction properties of uniform and segregated sand specimens was also revealed.

Research Products

• [Journal Article] Local deformation properties of sand specimens in triaxial liquefaction tests evaluated by direct and indirect observations (2015)
  • Author(s): Hoshino, R., Miyashita, Y., Sato, T. and Koseki, J.
  • Journal Title: Bulletin of ERS Volume: 48
• [Journal Article] 浚渫土を用いて埋立てた砂質地盤の液状化挙動に関する実験的研究 (2014)
  • Author(s): 古関 潤一, ファウジ ウサマジュニアンシャー, 佐藤 剛司, 宮下 千花
  • Journal Title: 生産研究 Volume: 66(6） Pages: 565-568
• [Journal Article] 多層リングを用いた繰返し単純せん断試験における多数回液状化時の特性変化 (2014)
  • Author(s): 古関 潤一, ワヒュディ セト, 佐藤 剛司, 宮下 千花
  • Journal Title: 生産研究 Volume: 66（6） Pages: 551-554
• [Presentation] 三軸液状化試験における砂供試体の局所変形特性の直接・間接評価 (2015)
  • Author(s): 星野龍一郎，古関 潤一，宮下千花，佐藤剛司
  • Organizer: 第50回地盤工学研究発表会
  • Place of Presentation: 北海道札幌市
  • Year and Date: 2015-09-01 – 2015-09-03
• [Presentation] 複数回液状化時の特性変化に関する多層リング繰返し単純せん断試験（その３） (2015)
  • Author(s): 青柳悠大，古関潤一，佐藤剛司，宮下千花
  • Organizer: 第50回地盤工学研究発表会
  • Place of Presentation: 北海道札幌市
  • Year and Date: 2015-09-01 – 2015-09-03
• [Presentation] 複数回液状化時の特性変化に関する多層リング繰返し単純せん断試験（その２） (2014)
  • Author(s): 古関潤一，Wahyudi Seto, 佐藤剛司，宮下千花
  • Organizer: 第49回地盤工学研究発表会
  • Place of Presentation: 福岡県北九州市
  • Year and Date: 2014-07-15 – 2014-07-17
• [Presentation] 複数回液状化時の特性変化に関する多層リング繰返し単純せん断試験 (2013)
  • Author(s): 古関潤一
  • Organizer: 第48回地盤工学研究発表会
  • Place of Presentation: 富山県富山市
• [Presentation] 多層リング単純せん断試験装置の開発 (2013)
  • Author(s): 佐藤剛司
  • Organizer: 第48回地盤工学研究発表会
  • Place of Presentation: 富山県富山市
• [Presentation] Observation of shear banding behavior of sand in torsional shear test using image analysis technique (2012)
  • Author(s): Wahyudi, S.
  • Organizer: Advances in Multiphysical Testing of Soils and Shales
  • Place of Presentation: Lausanne, Switzerland