软黏土地基中吸力桩水平承载性能数值分析

Numerical analysis of lateral bearing behaviors of suction piles on soft clay

以ABAQUS有限元软件为平台,采用理想弹塑性本构模型建立了吸力桩基础三维有限元模型,研究了不排水饱和软黏土中吸力桩基础在水平荷载作用下承载特性,分析了加载点位置和裙结构尺寸对吸力桩承载性能的影响。数值分析结果表明:裙结构的设置能明显增强吸力桩水平承载性能;加载点位置对吸力桩转动中心位置产生较大影响,当加载点靠近桩体中间位置时,转动中心靠近桩顶,桩后被动屈服区域最大,水平极限承载力最大。采用极限平衡法对吸力桩水平极限承载力进行了理论推导,并将理论结果与有限元结果对比,对比结果显示该方法能够用于吸力桩水平极限承载力的计算。

Based on the platform of ABAQUS, the ideal elastic-plastic constitutive model was used to establish three-dimensional finite element model of the suction piles, and the lateral bearing characteristics of the suction piles in the undrained saturated soft clay under the horizontal load were analyzed. The influence of the position of the loading point and the dimension of the skirt on the bearing performance of the suction pile was discussed. Numerical analysis results show that the lateral bearing performance of the suction piles can be significantly enhanced with the skirt, and the rotation center of the suction pile was influenced by the position of the loading point. The limit equilibrium method was used to theoretically deduce the lateral ultimate bearing capacity of suction piles, and the theoretical results were compared with the finite element results. The comparison results show that the method can be used to calculate the lateral ultimate bearing capacity of suction piles.