| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2015: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
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| 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.
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