超大埋深基坑降水开挖结构安全性分析及对地表沉降影响  

Analysis on the Structure Safety of Dewatering and Excavation of the Foundation Pit with Super-large Buried Depth and Its Influence on the Surface Settlement

作　　者：陈世凯 李坤杰 闫洪江 严涛[2] 王二力 罗成勇 刘大刚[2] CHEN Shikai;LI Kunjie;YAN Hongjiang;YAN Tao;WANG Erli;LUO Chengyong;LIU Dagang(China Railway Tunnel Group Fourth Division Co.,Ltd.,Nanning 530000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁隧道集团四处有限公司,南宁530000 [2]西南交通大学土木工程学院,成都610031

出　　处：《路基工程》2020年第2期53-57,共5页Subgrade Engineering

基　　金：中铁隧道局集团有限公司科技项目(2015-21);四川省科技厅科技创新创业项目(2018RZ0109)。

摘　　要：依托广西南宁轨道3号线埋深超过60 m的青秀山明暗挖地铁车站工程,进行了降水对地表沉降影响以及基坑开挖对围护结构安全性分析。结果表明:随着降水深度的增加,地表沉降增大,与基坑距离越近,地表沉降量越大;深基坑采用分层开挖,分层支护,围护结构的位移及横支撑的轴力均满足规范限值要求,施工安全。Based on the Qingxiushan subway station by open-cut and subsurface excavation method with the burial depth more than 60 meters on Nanning metro line 3 in Guangxi, the effect of foundation pit dewatering on the settlement of ground surface and the effect of foundation pit excavation on the safety of retaining structure are studied. The results show that: with the increase of dewatering depth, the settlement of ground surface increase, the closer to the foundation pit and the greater the settlement of ground surface appeared;deep foundation pit are excavated and supported by layers, both of displacement of retaining structure and lateral axial force of the supports can meet the limit value of the specification to ensure the construction safety.

关 键 词：基坑降水 地表沉降 基坑开挖 围护结构位移 横支撑轴力 

分 类 号：TU433[建筑科学—岩土工程]