液化场地群桩基础地震反应离心机试验及损伤数值模型研究

doi:10.13722/j.cnki.jrme.2021.1000

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Abstract Liquefaction-induced pile failure during earthquake is the main reason for building and public infrastructure damage. A centrifuge shaking table test was carried out to explore the seismic response of pile group foundations in the liquefaction sites. A finite element numerical model considering nonlinear liquefaction large deformation under dynamic static coupling，for carrying out plastic response analysis of pile group foundation under earthquake，was established. The research indicates that the liquefaction of the foundation under the action of an earthquake first appears on the surface of foundation around the pile. As the PBA increases，the liquefaction range of the foundation develops toward the depth of the foundation and both sides of the pile. The position of the maximum bending moment of pile group appears at the bottom of the pile，soil surface and caps. The larger deformation of the straight pile occurs at the bottom of the pile and the surface of the foundation，and the larger deformation of the oblique group piles appears in the middle of the piles. The excess pore pressure ratio of the foundation decreases with the foundation depth，but increases with the PBA. The foundation will produce foundation uplift within 20 times the pile diameter of the pile，and foundation seismic subsidence will occur in the far pile area. The group-pile suffers less compression damage and serious tensile damage. The pile bottom produces tensile failure during 0.3 g strong earthquake condition.

Key words： soil mechanics sand liquefaction group-pile foundation dynamic response plastic damage centrifuge shaking table test numerical simulation

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	LI Yurun1
	2
	YAN Zhixiao1
	ZHANG Jian1

Cite this article:

LI Yurun1,2,YAN Zhixiao1, et al. Seismic response of pile group foundations in liquefied sites based on centrifuge test and numerical simulation[J]. , 2023, 42(1): 212-223.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1000 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I1/212

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