基坑深层土体水平位移及支撑内力测试分析

Test Analysis on Horizontal Displacement of In-depth Soil Body and Internal Force of Supporting Structure in Foundation Pit Construction

基坑深层土体水平位移及支撑内力是控制基坑安全最重要的两个指标。结合工程实例,通过预埋的测斜管监测深层土体水平位移变化情况,从中得出了基坑水平位移随着基坑开挖而发展,随着土体开挖停止而基本停止,呈台阶式发展的变化规律,并用深层土体水平位移来验证围护桩的长度;另外,通过埋设在支撑梁中的钢筋应力计,分析了支撑梁内力在整个施工过程中呈波浪形的变化规律,并将监测内力与理论计算内力相比较。

This paper provides a test analysis of horizontal displacement of in-depth soil body and internal force of supporting structure in foundation pit construction. The test was conducted on site using embedded parts to monitor horizontal displacement of in-depth soil body and internal force of supporting structure as these two parameters are regarded as the most important ones for the safety in foundation construction. According to test results, the relationship between soil displacement and excavation depth with regard to excavation pmgrees are revealed, and this is used to verify the length of supporting piles. In addition, there is an analysis about the variation of interior force of supporting beams, and a comparison of interior force between real and ealculated ones.