广州某软土场地深基坑水平位移模拟及分析

Horizontal Displacement Simulation and Analysis of Deep Foundation Pit in a Soft Soil Site in Guangzhou

为研究软土地质条件下基坑开挖的水平位移响应,本文以广州市南沙区某深基坑工程为例,采用有限元软件Midas/GTS NX,针对基坑在软土地层的开挖过程进行了三维有限元模拟。对比实际监测数据显示,各工况下基坑顶部最大水平位移模拟的误差不超过28%。通过分析误差原因,可以发现尽管未充分考虑所有施工细节,三维有限元模拟的基坑水平位移满足规范要求且能得到监测数据支撑,为基坑支护设计提供参考。

In order to study the horizontal displacement response of foundation pit excavation under soft soil geological conditions,taking a deep foundation pit project in Nansha District,Guangzhou as an example,a 3D finite element simulation was conducted using the finite element software Midas/GTS NX for the excavation process of the foundation pit in soft soil.Compared with actual monitoring data,the error in simulating the maximum horizontal displacement at the top of the foundation pit under each working condition does not exceed 28%.Analyzing the reasons for the errors,it can be found that although not all construction details considered,the horizontal displacement of the foundation pit in the 3D finite element simulation meets the requirements of the specifications and can be supported by monitoring data,which provides reference for the design of foundation pit support.