Shear stress-strain relationship of sandy soil deposit using dynamic centrifuge modeling test

• Main Authors: Pao-Shuan Kwan, 鄺柏軒
• Other Authors: Chung-Jung Lee
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/24082528917557851586

碩士 === 國立中央大學 === 土木工程研究所 === 98 === The relationship of shear stress and shear strain of sandy soil is an important parameter and need to determination when soil stiffness and strength degraded as a result of sand liquefaction. Centrifuge modeling tests can provide an alternative source of information and reliable test results for assessing soil mechanism under shaking situation. The centrifuge model was conducted to simulate the seismic response for a 24m thick sandy soil deposit under an artificial gravity field of 80g. The testing models are subjected to different magnitude base-input acceleration of 1Hz and 16 seconds duration. A series of accelerometer and pore water pressure transducer arrays were installed to record the soil seismic response. Utilizing the acceleration history and the pore pressure history, the shear stress and shear strain at different depths can be obtained. And then the shear modulus can be acquired through calculation. From this research, the phenomenon of shear wave propagating upward is obviously being seen in dry sand, so is the site effect. The soil dilatation and surge can be found in saturated sand.