深基坑稳定性与支护效果评价的有限元分析

Research on the Stability and Evaluation of Retaining Structure for the Deep Foundation Pit by the Finite Element Modeling

本文以某地铁基坑工程为例,利用有限元数值模拟手段对基坑的稳定性、基坑周边地表沉降量、基坑坑壁及坑底位移进行了预测和分析,认为对于土质基坑开挖深度不超过5m时,利用抛物线函数预测法可以取得比较好的结果。而对于基坑开挖深度超过5m的基坑利用正态分布函数预测法可以取得比较好的结果。最后本文探讨了深基坑采取支护结构后利用有限元数值模拟手段进行变形预测的可行性,供工程技术人员借鉴。

The stability of foundation excavation,ground surface settlement,displacement of wall and bottom in a subway foundation excavation projects were analyzed using finite element numerical simulation.It was noticed that as to the soil foundation excavation which the digging depth no more than 5 meters,parabolic function prediction could achieve good results.While it was more than 5meters,normal distribution function prediction could achieve good results.Finally,we discussed the feasibility of deformation prediction of deep foundation excavation with retaining and protecting structure using finite element numerical simulation,which was useful for engineering and technical personnel.