软土隧道盾构出洞灾害的渗流应力耦合分析

›› 2010, Vol. 31 ›› Issue (S1): 383-387.

软土隧道盾构出洞灾害的渗流应力耦合分析

魏纲¹，郭志威²，魏新江^{1, 3}，陈伟军^{1, 3}

1. 浙江大学城市学院，土木工程系，杭州 310015；2. 河南省交通科学技术研究院有限公司，郑州 450006； 3. 浙江大学岩土工程研究所，杭州 310058

收稿日期:2010-04-29 出版日期:2010-08-10 发布日期:2010-09-09
作者简介:魏纲，男，1977年生，博士，副教授，主要从事地下隧道施工对周边环境影响及风险控制方面的研究工作。

Analysis of coupled seepage and stress of shield tunnel launching accident in soft clay

WEI Gang¹，GUO Zhi-wei²，WEI Xin-jiang ^{1, 3}，CHEN Wei-jun ^{1, 3}

1. Department of Civil Engineering, City College, Zhejiang University, Hangzhou 310015, China; 2. Henan Transportation Research Institute Co., Ltd., Zhengzhou 450006, China; 3. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

Received:2010-04-29 Online:2010-08-10 Published:2010-09-09

摘要/Abstract

摘要：

对盾构出洞口涌水涌砂灾害问题作了分析。利用Midas-GTS软件，建立了盾构出洞施工的有限元模型。考虑盾构出洞施工的渗流-应力耦合效应，研究了盾构工作井外加固土体前方高水位工况下，地下水绕加固土体下卧土层的渗流规律以及加固土体前方原状土的沉降规律。研究结果表明，在假定井外加固土体完全隔水情况下，洞门涌水涌砂灾害的发生与否受到土体加固长度、井外地下水等因素影响；土体加固长度的增加对工程安全有利，但成本较高；地下水位的降低能有效减小盾构出洞洞门涌水灾害的发生，需综合考虑工程安全性、经济性和工期等来确定合理的施工参数。

关键词: 盾构出洞, 渗流应力耦合, 土体加固, 地下水位

Abstract:

The disaster causes of gushing water and sand during shield departure from shaft are analyzed; and the finite element model of shield departure construction is established using Midas-GTS software. Considering coupled seepage and stress of shield departure construction, the groundwater permeates from reinforced soil around underlying layer to wall is analyzed; and the settlement of the undisturbed soil in front of the reinforced soil is studied. An example is given to demonstrate that: supposing the reinforced soil is impervious, the accident that water and sand inflows from tunnel portal is influenced by length of soil reinforcement and groundwater level; increasing the length of reinforced soil is good for engineering safety; but the cost is high. Decreasing the groundwater level could reduce the disaster of gushing water and sand during shield departure from shaft. Reasonable construction parameters for a project are determined by taking into account of economy, security and time limit.

Key words: shield departure from shaft, coupled seepage and stress, soil reinforcement, groundwater level

中图分类号:

U 456

魏纲，郭志威，魏新江，陈伟军. 软土隧道盾构出洞灾害的渗流应力耦合分析[J]. , 2010, 31(S1): 383-387.

WEI Gang，GUO Zhi-we，WEI Xin-jiang，CHEN Wei-jun. Analysis of coupled seepage and stress of shield tunnel launching accident in soft clay[J]. , 2010, 31(S1): 383-387.

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