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止水帷幕对基坑环境效应影响的有限元分析
引用本文:丁洲祥,龚晓南,俞建霖,金小荣,祝哨晨.止水帷幕对基坑环境效应影响的有限元分析[J].岩土力学,2005,26(Z1):146-150.
作者姓名:丁洲祥  龚晓南  俞建霖  金小荣  祝哨晨
作者单位:浙江大学岩土工程研究所 杭州市城市基础设施开发总公司 杭州
摘    要:采用Biot固结理论分析了止水帷幕对基坑工程环境效应的影响,包括止水帷幕不同打设深度的效果,以及两种封闭式止水帷幕发生漏水意外时对地下水位和坑外土体位移的影响等。在有限元编程中,将开挖土体置为空气单元可以简化处理过程。算例分析结果表明,深厚透水地基中增加竖向止水帷幕的深度并不能有效减小对周围环境的影响;漏水部位周围土体的渗流等势线较为密集,渗流速度较大,容易诱发扩大破坏;竖向封闭式止水帷幕漏水引起的坑边土体的沉降和地表土体的侧移相对较大,水位下降迅速等。其结果可供基坑工程漏水事故环境效应的评价和对策研究时参考。

关 键 词:Biot固结理论  止水帷幕  基坑  有限元法  地表沉降
收稿时间:2005-01-19

Finite element analysis of environmental effects of waterproof wall on foundation pit
DING Zhou-xiang,GONG Xiao-nan,YU Jian-lin,JIN Xiao-rong,ZHU Shao-chen.Finite element analysis of environmental effects of waterproof wall on foundation pit[J].Rock and Soil Mechanics,2005,26(Z1):146-150.
Authors:DING Zhou-xiang  GONG Xiao-nan  YU Jian-lin  JIN Xiao-rong  ZHU Shao-chen
Institution:1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China; 2. Hangzhou Municipal Infrastructure Development Corporation, Hangzhou 310001, China
Abstract:Based on Biot’s consolidation theory, the effects of the performance of waterproof-wall in deep foundation-pit on surrounding environment are analyzed. The subject investigated deals with the effectiveness of the burying depth of waterproof-wall, the influence of water leakage in enclosed structures of waterproof-wall on ground water table and foundation displacement, etc. For purpose of convenience, the excavated soil is treated as the idealized air element in FEM programming. The results show that in the case of thick pervious subsoil, the increase of the burying depth of waterproof-wall can hardly decrease the effects of foundation-pit on surrounding environment. The dense contours of seepage potential around the location of leakage are found with high seepage velocity, liable to induce expanded destruction. The water leakage occurred in the perpendicularly enclosed waterproof-wall will lead to the outstanding increase of the magnitude of foundation settlement around pit margin and ground lateral-displacement, as well as the rapid drawdown, etc. The conclusions could be provided for the appraisal and solution strategies for the effects of water leakage on surrounding environment.
Keywords:Biot’s consolidation theory  waterproof wall  deep foundation pit  finite element method  ground settlement  
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