Seismic response characteristics of straight group piles and soil in saturated sand
YAN Zhixiao1，LI Yurun1,2，ZHANG Jian1
1.College of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China;
2.Civil Engineering Technology Research Center of Hebei Province, Hebei University of Technology, Tianjin 300401, China
Abstract：In order to better study the dynamic response characteristics of pile groups and soil in saturated sand under earthquake action. This paper design the dynamic response shaking table test of 2×2 straight group piles in saturated sand liquefaction site. We obtain the time history curve of the cap, soil acceleration and pore pressure. Taking the experiment as the prototype, the numerical model is built on the ABAQUS finite element software platform to analyze the seismic dynamic response characteristics of the pile group and the soil. The two-dimensional finite element model of static and dynamic coupled nonlinear interaction of group pile foundation in liquefaction site is overcome by the finite element mesh adaptive adjustment technique to overcome the large deformation distortion problem by introducing the large deformation constitutive model of sand liquefaction. The numerical model calculation results are compared with the experimental results. The results show: Peak Acceleration 0.3g El-Centro Seismic Wave Condition Shaking Table Test Saturated sand soil has a very fast liquefaction rate. Under the action of 0.3g large earthquake, the shallow layer acceleration of the foundation soil is significantly attenuated. The development of pore water pressure in saturated sand foundation affects the acceleration response of soil and pile foundation caps. Soil liquefaction directly leads to a reduction in the acceleration value. The numerical simulation of the shallow layer of the acceleration foundation appears first and then scales down, and the deep soil is basically consistent with the input waveform. The numerical simulation of the excess pore water pressure and the excess pore pressure ratio is basically the same as the test, and the simulated displacement results of the pile are more conservative than the test.
闫志晓1，李雨润1,2，张健1. 饱和砂土中直群桩及土体地震动力响应特征研究[J]. 振动与冲击, 2020, 39(18): 44-53.
YAN Zhixiao1，LI Yurun1,2，ZHANG Jian1. Seismic response characteristics of straight group piles and soil in saturated sand. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(18): 44-53.
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