Abstract：3D soil-water coupled numerical simulation were carried out based on the centrifuge model tests on single-pile foundation in saturated sand (Dr=40%) using the static-dynamic finite element program DBLEAVES. The acceleration response, pore water pressure, displacement and bending moment of pile , the mechanical behaviors of liquefiable sand and pile were examined to analyze the dynamic responses of sand and pile subjected the weak earthquake motion (peak value of acceleration 0.08g) and strong earthquake motion (peak value of acceleration 0.47g). Specially, an elasto-plastic cyclic mobility model was used to describe the properties of soil, while the beam element was used to simulate the pile. The simulated results showed that: (1) The excess pore water pressure can ‘bock’ the seismic waves. The acceleration of ground surface was significant reduced while the soil was almost liquefied. However, the acceleration could be amplified while the excess pore water pressure was relatively small. (2) The peak value of excess pore water pressure ratio during earthquake is one of the main factors for the settlement of ground surface. Moreover, the main part of settlement occurred during the period of post-earthquake as the excess pore water pressure dissipated. (3) The comparison between the numerical simulation and the model test showed that the used cyclic mobility model could properly describe the seismic behavior of soil. The results also verified the validity of the used program DBLEAVES and FEM method.
包小华 刘志鹏 徐长节 苏 栋 明海燕 谢雄耀. 可液化地基单桩基础离心机模型试验的三维数值分析[J]. 土木工程学报, 2019, 52(S1): 53-63.
Bao Xiaohua Liu Zhipeng Xu Changjie Su Dong Ming Haiyan Xie Xiongyao. 3D numerical analysis of centrifuge model tests on pile foundation in liquefiable soil. 土木工程学报, 2019, 52(S1): 53-63.
