饱和砂土中直群桩动力响应离心机振动台试验与简化数值模型研究

doi:10.13722/j.cnki.jrme.2019.0271

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Abstract The analysis of lateral dynamic responses of high cap straight piles in saturated sand liquefaction sites is a hot and difficult point for geotechnical engineering. A 2×2 group straight pile model in saturated sand liquefaction sites was designed，and the centrifuge vibration test was carried out to analyze the dynamic responses of piles and soil in liquefaction sites. The sand liquefaction large deformation constitutive model was introduced into ABAQUS finite element software platform and the finite element mesh adaptive adjustment technique was used to overcome the large deformation distortion problem. A 2D finite element model for simulating the static and dynamic coupled nonlinear interaction of pile foundations in liquefiable sites was established and compared with the test. The test results show that，in the case of the sine wave with a peak acceleration of 0.3 g，the liquefaction rate of the saturated sand foundation is very fast. The peak accelerations of both the pile cap and the soil will not exceed the input wave peak，and the acceleration of the pile cap begins to attenuate after the ground liquefies. The development of the excess pore water pressure in saturated sand soil directly affects the acceleration response，and the liquefaction of soil directly leads to acceleration attenuation. The acceleration dynamic response behavior by numerical simulation is similar to that from the experimental test，and the scaled-down results of numerical simulation are approximately equal to the experimental results. The excess pore water pressure and the excess pore pressure ratio obtained from simulation and test are consistent. The simulation results also indicate that the shallow soil liquefies more obviously than the deep soil and that the displacement of the pile cap is smaller than that of the test.

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soil mechanics centrifuge shaking table test saturated sand straight group pile numerical simulation
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	LI Yurun1
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	YAN Zhixiao1
	ZHANG Jian1
	HUANG Da1

Cite this article:

LI Yurun1,2,YAN Zhixiao1, et al. Centrifugal shaking table test and numerical simulation of dynamic responses of straight pile group in saturated sand[J]. , 2020, 39(6): 1252-1264.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0271 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I6/1252

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