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分析影响基坑支护破坏因素对于防止基坑事故的发生 ,优化基坑支护设计有重要意义。本文用弹塑性有限元方法模拟基坑破坏过程 ,分析了影响基坑支护破坏的因素。分析结果表明 ,土体和桩墙的弹性模量都对基坑的位移有一定影响 ,但土体弹性模量的影响比桩墙弹性模量的影响更大。根据这些结果 ,推论出传统基坑设计方法与弹性地基梁法的不足之处。另外 ,分析结果还表明 ,基坑坑顶水平位移与土体弹性模量的关系无固定规律 ,而坑底最大位移与弹性模量呈非线性的关系。由此推论出基坑坑顶水平位移监测方法的不可靠性。
It is of great significance to analyze the factors that affect the support of foundation pit in order to prevent the occurrence of foundation pit accidents and optimize the design of foundation pit support. In this paper, the elastic-plastic finite element method is used to simulate the process of foundation pit failure, and the factors that affect the failure of the foundation pit support are analyzed. The analysis results show that the elastic modulus of soil and pile wall all affect the displacement of foundation pit, but the effect of soil elastic modulus is more than the elastic modulus of pile wall. Based on these results, the shortcomings of traditional foundation pit design method and elastic foundation beam method are deduced. In addition, the analysis results also show that the relationship between the horizontal displacement at the pit top and the soil elastic modulus is not fixed, while the maximum displacement at the bottom of the pit is nonlinearly related to the elastic modulus. It is deduced that the method of monitoring the horizontal displacement of pit pit is not reliable.