武汉某深基坑工程变形数值模拟与现场监测的对比分析

Contrastive Analysis of Numerical Simulation and On-site Monitoring of the Deformation of a Deep Foundation Pit in Wuhan

为保证深基坑工程的稳定性和安全性,掌握深基坑支护结构及土体的变形规律尤为重要。以武汉某深基坑工程为研究背景,利用MIDAS/GTS三维有限元软件对基坑开挖过程中三种工况下基坑支护桩水平位移、基坑土体水平位移及基坑外地表土体沉降变形特征进行了数值模拟,并与现场实际监测数据进行了对比分析。结果表明:随着基坑开挖深度的增加,基坑支护桩水平位移、基坑土体水平位移、基坑外地表土体沉降量越来越大,需要在施工过程中注意及时处理;模拟曲线与现场实际监测曲线的形状和变形趋势基本吻合,验证了数值模拟结果的合理性,对类似基坑工程的设计和施工具有一定的参考价值。

In order to guarantee the stability and safety of deep foundation pit,it is important to grasp the deformation law of supporting structure in deep foundation pit and soil.This paper by taking a deep foundation pit engineering in Wuhan as the research background and using the three dimensional finite element software MIDAS/GTS simulates variation characteristics of supporting pile horizontal displacement and soil horizontal displacement and soil subsidence outside the foundation pit of three working conditions in the excavation of foundation pit,and compares with the on site monitoring data.The results show that three types of deformation are getting bigger and bigger,and the emergency treatment should be noted during the construction process.The curve shape and deformation trend of simulation are identical with monitoring by analyzing.The paper verifies the rationality of numerical simulation and has some reference value for the design and construction of similar excavation.