广州地铁燕塘站基坑降水的三维渗流场有限元分析  

3-D finite element analysis on the seepage field for the foundation pit dewatering at Yantang station of Guangzhou subway

作　　者：刘昌军[1] 唐瑜[2] 卢羽平[2] 赵雨[3] 叶长锋[3] 

机构地区：[1]中国水利水电科学研究院,北京100038 [2]中水顾问集团成都勘测设计研究院,成都610072 [3]国核电力规划设计研究院,北京100094

出　　处：《工程勘察》2012年第9期38-42,共5页Geotechnical Investigation & Surveying

基　　金：国际科技合作与交流基金项目(2010DFA74520);国家十一五科技支撑课题(2008BAB42B05;2008BAB42B06)

摘　　要：基坑降水是地铁深基坑工程施工设计所关注的重点问题,尤其要关注基坑降水后的三维渗流场分布、降水效果和渗透稳定等。本文采用了潜水承压水稳定渗流场理论和改进的截止负压法对广州地铁燕塘站深基坑降水后的三维渗流场进行了有限元分析。研究了布置不同抽水井和帷幕灌浆等多个工况的渗流场分析和基坑涌水量。研究结果表明,采用抽水井和对承压含水层进行灌浆帷幕的设计方案,深基坑降水后的渗流场和地基的渗透比降满足设计要求。Foundation pit dewatering is a key problem in the construction design of the deep foundation pit engineering. The particular attention should be paid to the three-dimensional seepage field distribution, effectiveness of dewatering, seepage stability and other problems after foundation pit dewatering. The three-dimensional seepage field distribution after foundation pit dewatering for the deep foundation pit at Yantang Station of Guangzhou Subway is analyzed with finite element method, with the assistance of stable seepage field theory for phreatic water and confined water and modified cut-off negative pressure method. The seepage filed distribution and foundation pit discharge under load cases of the different layout of the pumping wells and grouting curtain are studied. The results show that the seepage field and seepage gradient of the foundation after foundation pit dewatering satisfy the design requirement for the cases with pumping wells and grouting curtain on the confined aquifer.

关 键 词：深基坑 灌浆帷幕 地下连续墙 改进的截止负压法 有限元法 

分 类 号：TU463[建筑科学—结构工程]