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可液化地基中桩基础地震响应分析一直是岩土工程抗震研究的热点和难点。针对这一问题,采用砂土液化大变形统一本构模型来描述可液化地基土体的应力应变关系,建立了一个3×5的群桩三维计算模型,采用三维弹塑性有限元动力时程分析,将地基、群桩基础和上部结构作为一个系统研究群桩基础的地震动响应规律,重点关注桩与土的运动相互作用以及水平方向的弯矩在地震荷载作用下的分配情况。结果表明可液化地基中桩基础的弯矩受桩与土运动相互作用影响显著;不同桩的弯矩最大值不同,角桩最大,边桩次之,中心桩最小;弯矩最大值出现的位置不相同,角桩和边桩弯矩最大值出现在上部非液化层与液化层界面处,中心桩弯矩最大值出现在桩头处。
Seismic response analysis of pile foundations in liquefiable ground has always been a hot and difficult issue in geotechnical engineering. In order to solve this problem, a unified constitutive model of large deformation of sand liquefaction is used to describe the stress-strain relationship of liquefiable foundation soils. A 3 × 5 pile group three-dimensional calculation model is established. The three-dimensional elasto-plastic finite element dynamic time history analysis , The foundation, pile foundation and superstructure as a systematic study of the law of seismic response of group pile foundation, focusing on the interaction of pile and soil movement and the distribution of bending moment in the horizontal direction under earthquake load. The results show that the bending moment of pile foundation in liquefiable foundation is significantly affected by the interaction of pile and soil movement. The maximum bending moment of different piles is different, the angle piles are the largest, the side piles are the second and the center piles are the smallest. The maximum bending moment of corner piles and side piles appeared at the interface between the upper non-liquefaction layer and liquefaction layer, and the maximum bending moment of the center pile appeared at the pile head.