深基坑围护结构受力特性分析

Analysis of Stress Characteristics of Retaining Structure of Deep Foundation Pit

由于计算过程简单、所需参数少,现行基坑规范中均采用的是基于平面应变理论的弹性支点法对基坑围护结构进行设计、计算。根据哈尔滨至牡丹江客运专线明挖段基坑工程现场监测结果,分析围护结构在基坑开挖过程中的受力大小及特征,并将最终实测受力与弹性支点法的计算结果进行对比分析,分别得到围护结构全开挖过程中的实测和规范对应的安全系数Fs。通过对现场实测结果与规范计算结果对比分析,在探讨该地区基坑设计的同时,也希望能为该地区类似基坑围护结构的设计与施工提供一些有用的参考。

Because of the simple calculation and fewer parameters,the model of the elastic brace based on the plane strain theory was commonly used to design and calculate the retaining structure of the foundation pit in the current specification.In this paper,according to the engineering field monitoring results of the open-cut foundation pit of the Harbin-Mudanjiang Passenger Dedicated Line,the stress and the characteristics of the retaining structure in the process of the excavation were analyzed.The measured stress and the calculation result were compared and analyzed to obtain the safety factors Fs corresponding to the measured and specification,respectively.This analysis hopes to provide useful references for the design and construction of similar retaining structures of foundation pits in local areas.