止水帷幕对基坑环境效应影响的有限元分析

›› 2005, Vol. 26 ›› Issue (S1): 146-150.

止水帷幕对基坑环境效应影响的有限元分析

丁洲祥¹，龚晓南¹，俞建霖¹，金小荣¹，祝哨晨²

1. 浙江大学岩土工程研究所，杭州 310027；2. 杭州市城市基础设施开发总公司，杭州 310001

收稿日期:2005-01-19 发布日期:2005-12-15
作者简介:丁洲祥，男，1976生，博士研究生，从事土力学与地基处理等方面的研究

Finite element analysis of environmental effects of waterproof wall on foundation pit

DING Zhou-xiang¹, GONG Xiao-nan¹, YU Jian-lin¹, JIN Xiao-rong¹, ZHU Shao-chen²

1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China; 2. Hangzhou Municipal Infrastructure Development Corporation, Hangzhou 310001, China

Received:2005-01-19 Published:2005-12-15

摘要/Abstract

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

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.

Key words: Biot’s consolidation theory, waterproof wall, deep foundation pit, finite element method, ground settlement

中图分类号:

TB 115

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]. , 2005, 26(S1): 146-150.

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]. , 2005, 26(S1): 146-150.

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