疏干兼降压井设计在淤泥质地层深基坑降水中的应用  

Application of Dewatering and Depressurization Well Design in Deep Foundation Excavation Dewatering of Muddy Stratum

作　　者：崔建强 王有旗 汪正斌 吴振宇 刘普前 刘玉国 刘大刚[3,4] CUI Jianqiang;WANG Youqi;WANG Zhengbin;WU Zhenyu;LIU Puqian;LIU Yuguo;LIU Dagang(The 5th Engineering Co.,Itd.of China Railuay 25th Bureau Group Co.,Ltd,Qingdao,Shandong 266000,China;Shenzhen Metro Group Co,Itd,Shenzhen,Guangdong 518038,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southuvest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二十五局集团第五工程有限公司,山东青岛266000 [2]深圳市地铁集团有限公司,广东深圳518038 [3]西南交通大学土木工程学院,四川成都610031 [4]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《施工技术》2020年第17期70-74,共5页Construction Technology

基　　金：中铁二十五局集团第五工程有限公司资助项目(zt25-5gs2017-szdt-007)。

摘　　要：深基坑降水通常采用有止水帷幕且止水帷幕隔断地下水力联系的降水方法。对于淤泥质地层,土体渗透系数低,降水难度大,为防止基坑突涌,在布设疏干井的同时还需布置降压井,以降低地下水位承压水头。但由于场地条件的限制,对降压井的布设造成一定难度,同时也会增加成本。优化了疏干井的结构,提出"一井两用",将疏干井兼作降压井成功应用于淤泥质地层深基坑降水工程中并提出了疏干井兼降压井设计方法,并对疏干兼降压井的结构形式及施工工艺作了详细介绍。Deep foundation excavation dewatering usually uses precipitation methods with water-stop curtains and water stop curtains to separate groundwater forces.For muddy formations,the permeability coefficient of soil is low and precipitation is difficult.To prevent inrush of foundation excavation,drainage wells need to be laid at the same time as the drainage wells are arranged to reduce the pressure head of groundwater.However,due to the constraints of site conditions,the deployment of the decompression wells will be difficult and cost will increase.This paper optimizes the structure of the dredging wells and proposes"one well for dual use".It is successfully applied in the dredging wells as well as the decompressed wells to the deep foundation excavation dewatering project in a muddy formation and this paper proposes a design method for the dredging wells and the decompressed wells.The structure and construction process of the dewatering and depressurization wells are introduced in detail.

关 键 词：地铁 深基坑 降水 试验 疏干井 降压井 

分 类 号：U231[交通运输工程—道路与铁道工程] TU753[建筑科学—建筑技术科学]