深基坑降水中墙-井作用机理及工程应用  

Mechanism and Application of Interaction between Underground Wall and Well in Dewatering for Deep Excavation

作　　者：王建秀[1,2] 郭太平[2] 吴林高[1,2] 朱雁飞 唐益群[1,2] 杨坪[1,2] 

机构地区：[1]同济大学岩土工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]上海隧道股份有限公司,上海200093

出　　处：《地下空间与工程学报》2010年第3期564-570,共7页Chinese Journal of Underground Space and Engineering

基　　金：上海市人才发展资金(2007);上海市自然科学基金(10ZR1431500);上海市重点学科(地质工程)(B308)

摘　　要：近年来,随着我国基本建设的发展,越来越多的深基坑涉及承压水控制与降水引起的环境保护问题。特别是在建筑密集区,如何控制基坑降水引发的沉降成为研究的热点。在第三类深基坑降水中,将墙-井作用划分为4种模式:完全内包型、平齐型、部分内包型和完全外露型。基于墙-井作用改变水流方向、增加渗流路径和减小过水断面,利用地层渗透各向异性实现水位和沉降的控制。上海地铁9号线宜山路车站深基坑降水工程实践表明,采用墙-井第一模式控制坑外水位和地面沉降是可行的,可以作为类似深基坑降水工程的参考依据。Recently,with the development of construction in China,deep foundation pit has to face the problems of dewatering and subsidence.Especially in the region with dense building and protected building,it is most important to balance the dewatering project and induced subsidence.In the 3rd type seepage mode divided by the depth of concrete wall into aquifer,the interaction modes between concrete wall used as curtain and well filer tube can be divided into 4 modes：（1）well filter is inner covered completely by concrete wall;（2）depth of bottom of well filter tube is equal to that of concrete wall;（3）part of well filter tube is inner covered by concrete wall;（4） well filter is not covered by concrete wall and exposed.The interaction mechanism between well and concrete wall can be explained with the concrete wall change the direction of flow path and anisotropic property of aquifer,lengthen the seepage path and cut the section area of aquifer etc.The practice of mode I in Yishan Rd.station,subway No.9,Shanghai indicates that the drawdown was controlled in reasonable level with the interaction between concrete wall and well,which can be referred by the similar project.

关 键 词：深基坑 降水 第三类渗流 墙-井作用 沉降控制 

分 类 号：O319.56[理学—一般力学与力学基础]