深基坑工程中空间效应的影响分析

Analysis on Space Effect in Deep Foundation Pit

深基坑是一个复杂的三维空间问题,而目前的支护设计中常常将其简化成二维平面问题,并按照最不利单元进行变形及内力控制,从而导致设计偏于保守。为研究空间效应对深基坑支护挡墙内力的影响,本文主要借助三维有限元方法对某实际工程进行分析,并将计算结果与实际监测数据进行了比较。根据分析结果,深基坑开挖过程中沿挡墙方向上空间效应的主要影响范围约为2倍坑深的范围。最后,本文根据研究结果对实际支护设计工作提出了优化建议。

The supporting of deep foundation pit is a complex three-dimensional space problem. Currently the support design is often simplified as a plane problem,and controlling by the element with the most adverse deformation and internal force,which leads the design to conservative. A project has been analyzed using the finite element analysis software to research the space effect of deep foundation pit on the internal force of the retaining wall,and the calculation results have been compared with the monitoring data. According to the results of the analysis,the influence range of the space effect along the retaining wall is about 2 times the depth of the pit. And the paper recommends optimization for supporting design according to the results of the research.