地铁车站深基坑落底式地连墙止水效应分析  

Analysis on the Water Sealing Effect of the Bottom Falling Diaphragm Wall in Deep Foundation Pit of Subway Stations

作　　者：范卫琴 张红章 熊宗海 谢武军 谢昭宇 FAN Weiqin;ZHANG Hongzhang;XIONG Zonghai;XIE Wujun;XIE Zhaoyu(College of Intelligent Construction,Wuchang University of Technology,Wuhan Hubei 430074,China;Wuhan Fengda Geological Engineering Co.Ltd.,Wuhan Hubei 430223,China;Hubei Daoze Survey and Design Institute Co.,Ltd,Wuhan Hubei 430074,China;School of Engineering,China University of Geosciences(Wuhan),Wuhan Hubei 430074,China)

机构地区：[1]武昌理工学院智能建造学院,湖北武汉430074 [2]武汉丰达地质工程有限公司,湖北武汉430074 [3]湖北道泽勘测设计院有限公司,湖北武汉430074 [4]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《兰州工业学院学报》2023年第6期92-97,共6页Journal of Lanzhou Institute of Technology

基　　金：福建省自然科学基金项目(2018J01515)。

摘　　要：为检验地连墙的封闭性并获取落底式地连墙条件下等效水文地质参数,以武汉某地铁三层岛式站台车站深基坑降水为例,现场开展抽水连通试验和群经大降深试验。试验结果表明:连通试验中抽水井水位降深最大,变化速率最快,坑内观测井次之,坑外观测水位几乎未变化;群井大降深试验中坑内观测井水位降深大,而坑外观测井水位降深很小,两种试验均表明地连墙的封闭性好。通过试验实测数据计算出等效渗透系数和降水井影响半径,可以为评估基坑降水引发地下水位变化及对地面沉降方面影响提供基础数据。In order to verify the sealing of the diaphragm wall and obtain equivalent hydrogeological parameters under the condition of a falling diaphragm wall,taking the deep foundation pit dewatering of a three story island platform station in Wuhan as an example,on-site pumping connection tests and group economic large drop depth tests are conducted.The test results show that the water level of the pumping well has the greatest depth drop in the connectivity test and the rate of change is the fastest,followed by the observation well inside the pit,and the observation water level outside the pit has almost no change;In the group well large drawdown test,the observed water level drop inside the pit is large,while the observed water level drop outside the pit is very small.Both tests indicate good sealing of the diaphragm wall.By calculating the equivalent permeability coefficient and the influence radius of the dewatering well through experimental measurement data,basic data can be provided for evaluating the changes in groundwater level caused by foundation pit dewatering and its impact on ground settlement.

关 键 词：深大基坑 连通试验 群井试验 深井降水 

分 类 号：TU753[建筑科学—建筑技术科学]