Study on property change during multiple liquefaction events and its prediction

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04036
• 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, 大学院工学系研究科(工学部), 教授 (30272511)
• Co-Investigator(Renkei-kenkyūsha): MIYASHITA Yukika 東京大学, 生産技術研究所, 技術職員 (20396914) ; MATSUMARU Takaki 東京大学, 大学院工学系研究科, 助教 (00425927)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 地盤工学 / 地盤防災 / 再液状化 / 室内土質試験 / 模型振動実験 / 初期せん断

Outline of Final Research Achievements

In order to investigate experimentally the property change during multiple liquefaction events, a series of stacked-ring simple shear tests under constant volume condition, undrained cyclic torsional shear tests on hollow cylindrical specimen, and shaking table tests on level saturated sand ground model was conducted. As a result, it was revealed that, irrespective of the past liquefaction histories, the re-liquefaction resistance is largely reduced when the immediate-past liquefaction stage induces a significant shear strain. It was also verified that the accuracy of prediction of the re-liquefaction resistance can be improved by normalizing the energy that is dissipated during the immediate-past liquefaction stage with the current mean effective stress.

Free Research Field

地盤工学