悬挂式止水帷幕基坑降水对临近地铁变形影响分析

Analysis of the Influence of Precipitation in Suspended Waterproof Curtain Pit on the Deformation of Adjacent Subways

采用悬挂式止水帷幕的深基坑承压水降水对周边环境的影响问题不容忽视。以上海某临近地铁换成节点的深基坑项目为依托,分析了基坑开挖前试降水对临近地铁车站和隧道结构变形的影响规律。结果表明,采用悬挂式止水帷幕情况下坑内降水对坑外地铁结构变形影响量和影响范围均比较大,地铁结构变形量与结构刚度、与降水基坑的距离、降水基坑的面积、水位降深有比较大的相关性。

The impact of deep foundation pit confined water pumping using suspended water stop curtains on the surrounding environment cannot be ignored.Based on a deep foundation pit project where near a subway transfer node in Shanghai,the impact of the trial dewatering before excavation of the foundation pit on the displacement of the nearby subway station and tunnel structures was analyzed.The results show that the influence and range of the settlement deformation of the subway structure outside the pit are relatively large due to the precipitation inside the pit.The deformation of the subway structure is closely related to the structural stiffness,the distance from the foundation pit,the area of the foundation pit,and the depth of water level drop.