水平荷载下挤扩支盘桩群桩变形性状有限元分析

Analysis on deformation characteristic of squeezed branch and plate pile under lateral load with finite element method

目前,有关群桩水平承载性状的试验和理论研究资料较少,特别是对于挤扩支盘桩群桩基础在承受水平荷载时的受力和变形性状还未见相关报道.针对这个问题,作者在考虑桩土之间非线性接触、桩周土弹塑性、桩土体系初始应力场的情况下,利用有限元与无限元耦合的方法,分析了水平荷载作用下分别包含2根,3根,4根基桩的挤扩支盘桩群桩基础的变形发展过程,并深入研究了承力盘位置、桩间距、桩数等因素对基桩本身、桩周围土体和桩土之间相对位移的影响规律.

At present, the test and theoretical research about pile group under lateral load are rare, especially for the new type of pile, the squeezed branch and plate pile, which has no resports about it. To solve this problem and considering the no - linear contact between pile and soil, elastic - plastic of soil, initial stress condition of mode, the deformation characteristic of squeezed and plate pile, and soil around pile under lateral load are analyzed by using finite element and infinite element couple method. The influence law of factors such as plate position, pile spacing and pile number to pile displacement, soil displacement and relative displacement between pile and soil in pile group with two piles, three piles and four piles are detail studied.