Precipitation can alter soil mechanical properties and affect excavation safety,particularly during periods of high precipitation.This study is based on the"7.20" rainstorm that occurred in Zhengzhou,Henan Province.A deep foundation pit of "xiaonangang" station of Zhengzhou was taken as a case study,and MIDAS finite element software was adopted to analyze engineering data measured during rainfall.This work also reveals the key factors of subway deep foundation pit deformation caused by short-term exceptionally heavy rainfall,analyzes the method of precipitation han-dling in the case of fully storing water in the foundation pit,and proposes some precautionary measures for the founda-tion pit project facing exceptionally heavy rainfall.The results are as follows.The main factors of the extra heavy rain affecting the deep foundation pit of the subway are the dislocation of the internal support and the role of pit filling,of which the main reason for the dislocation of the internal support is that the pit filling reduces the difference between the soil and water pressure on both sides of the enclosing structure,thus weakening the deformation of the enclosure.When descending the full storage pit,it is appropriate to use the method of joint descending of both the inside and outside of the pit,and timely apply steel support;In the face of extra heavy rain,the steel support should timely raise retaining wall and strengthen the connection between steel support and walings.
关键词
短时强降雨/地铁深基坑/有限元分析/支护结构/影响因素
Key words
short-time intense rainfall/deep foundation pit of subway/finite element analysis/support structure/influencing factors
维普
万方数据