强降雨对粉质黏土地区基坑围护结构变形影响的研究

Study on the influence of heavy rainfall on the deformation of foundation pit retaining structure in silty clay area

目前关于强降雨对基坑支护结构变形的影响研究较少,依托杭州市某公建项目基坑工程,利用有限元软件对拉森钢板桩+H型钢内支撑支护进行模拟,分别模拟计算基坑正常开挖过程中围护结构的变形,以及基坑开挖至坑底后强降雨作用下的基坑支护结构变形,从而分析强降雨对围护结构变形的影响。对比两种工况的模拟结果可知,强降雨会显著降低土体的强度,导致基坑发生较大变形,应合理安排工期,尽量避开强降雨天气进行施工。

At present,there are few studies on the impact of strong rainfall on the deformation of foundation pit support structures.This article relies on a public construction project in Hangzhou,using finite element software to simulate the Larsen steel sheet pile+H-shaped steel internal support,respectively simulating and calculating the deformation of the foundation pit support structure during the normal excavation process,as well as the deformation of the foundation pit support structure under the action of strong rainfall after the foundation pit is excavated to the bottom of the pit,Thereby analyzing the impact of heavy rainfall on the deformation of the retaining structure.Comparing the simulation results of the two working conditions,it can be seen that heavy rainfall can significantly reduce the strength of the soil mass,leading to significant deformation of the foundation pit.Therefore,the construction period should be reasonably arranged to avoid heavy rainfall weather for construction.