基于弹性抗力法的基坑支护结构三维变形分析

摘要

对比了目前已有的基坑支护结构内力及变形分析方法,提出了空间弹性抗力法的概念.对该方法的计算模型、原理及公式进行了简述,并编制了相应分析计算程序.结合基本算例,分析了不同支撑情况下支护结构的内力及变形情况,并总结出角部支撑的合理布置方式,同时分析了超载不均匀情况下支护结构的内力与变形情况,研究了平面小尺寸基坑是否需要布置支撑的问题,对基坑支护结构设计具有一定的参考价值.%Methods to analyze the existing internal force and deformation of foundation pits' retaining structures are compared,and the concept of space elastic resistance method is put forward,including its calculation model,principle,formulas and corresponding program.Through an example,the reasonable arrangement for corner supports is summarized by analyzing the internal force and deformation of retaining structures under different supports,and the inner force and deformation of the supporting structure under inhomogeneous overload are analyzed.Moreover,the question whether the supports need to be laid to the foundation pits with small plane size is investigated.These conclusions are of certain reference value for the design of foundation pits' retaining structures.