基于JC法的多支撑桩墙支护基坑变形可靠性分析

基坑围护结构的设计与评价方法一般采用安全系数法,但该方法不能考虑参数随机性和变异性,而可靠性分析方法可以充分考虑基坑支护体系参数的随机性和变异性,能更为客观地反映基坑的安全性。本文针对多支撑桩墙支护深基坑,建立了关于多支撑桩墙支护深基坑的变形计算模型,在该模型的基础上,应用JC法分析基坑的变形可靠性,并对某工程实例现场实测数据与可靠性分析结果对比分析。通过对比分析得出,可靠性分析能大体反应围护结构可能存在风险的区域及其失效概率,是一种有效的基坑设计和评价的手段。

JC-based Deformation Reliability Analysis on Foundation Pit

For foundation pit retaining structure, traditional evaluating methods is safety factor, but traditional evaluating method can not consider randomness and variability of the parameter. The reliability analysis method can fully consider the randomness and variability of the parameters of the foundation pit retaining system, and it can more accurately reflect the safety of the foundation pit. This paper is based on foundation pit retaining structure with multilayer bracings struts, the deformation calculation model of foundation pit retaining structure with multilayer bracings struts is established. On the basis of the model, JC method is used to calculate the deformation reliability of foundation pit. The results of the measured data and reliability analysis of a deep foundation pit are compared and analyzed. Through comparison and analysis, it is concluded that the reliability analysis can reflect the risk areas and the failure probability of the enclosure structure, and it is an effective method for the design and evaluation of the foundation pit.