基坑开挖对临近地铁隧道影响的两阶段分析方法

›› 2011, Vol. 32 ›› Issue (7): 2085-2092.

基坑开挖对临近地铁隧道影响的两阶段分析方法

张治国^{1, 2, 3}，张孟喜¹，王卫东⁴

1. 上海大学土木工程系，上海 200072；2. 同济大学地下建筑与工程系，上海 200092； 3. 上海市应用数学和力学研究所，上海 200072；4. 华东建筑设计研究院有限公司，上海 200002

收稿日期:2009-12-10 出版日期:2011-07-10 发布日期:2011-06-30
作者简介:张治国，男，1978年生，博士后，主要从事城市地下工程施工对周围环境影响评估方面的研究
基金资助:
国家自然科学基金（No. 510081880）；中国博士后科学基金（No. 20100470677）

Two-stage method for analyzing effects on adjacent metro tunnels due to foundation pit excavation

ZHANG Zhi-guo^{1, 2, 3}，ZHANG Meng-xi¹，WANG Wei-dong⁴

1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai 200072, China; 4. East China Architecture Design and Research Institute, Shanghai 200002, China

Received:2009-12-10 Online:2011-07-10 Published:2011-06-30

摘要/Abstract

摘要： 城市高层建筑施工中进行基坑开挖必然引起周围地层移动，从而造成临近地铁隧道纵向不均匀沉降，最终对地铁正常运营产生严重影响。针对目前该领域存在的三维有限元建模复杂及计算耗时的缺点，考虑基坑开挖引起的坑底和四周坑壁土体同时卸荷产生的影响，提出了基坑开挖对临近地铁隧道纵向变形影响的两阶段分析方法。首先计算基坑开挖作用在地铁隧道上的附加荷载，然后基于Winkler地基模型建立地铁隧道纵向变形影响的基本微分方程，根据Galerkin方法将该方程转换为一维有限元方程进行计算，同时研究了不同隧道埋深、距离基坑开挖现场远近、不同地基土质和不同隧道外径等因素对隧道纵向变形的影响。结合大型三维有限元数值模拟以及现场实测数据将计算结果进行了对比，得到较好的一致性。成果可为合理制定基坑开挖对临近地铁隧道的保护措施提供一定的理论依据

关键词: 基坑开挖, 地铁隧道, 纵向变形, Galerkin方法, 两阶段分析方法

Abstract: Unloading of foundation pit excavation will no doubt induce the soil deformation and have result in uneven settlements of adjacent metro tunnels. The excessive settlements may induce the crack of tunnel segments and eventually may affect the safety use of metro trains. Two-stage method is presented for determining the longitudinal deformation of metro tunnels caused by adjacent foundation pit excavation. The soil unloading effects of the bottom plan and the surrounding walls induced by the foundation pit excavation can be considered by this method. Firstly the additional stress due to adjacent foundation pit excavation is calculated. Secondly the governing differential equation is built up based on Winkler model. Then the differential equation is deduced to the finite element equation by the Galerkin method; and vertical displacement and internal forces along longitudinal axis are obtained. Furthermore, the parametric analysis of existing tunnels is carried out; such as, the different depths, the distance from the excavation site, the different geologic conditions and the different outer diameter of the tunnel. Finally, the results from present approach are compared with that from 3D numerical simulation and measured data; good agreement is obtained. It may provide certain basis to draw up correctly protective measures of metro tunnels influenced by adjacent excavation

Key words: foundation pit excavation, metro tunnel, longitudinal deformation, Galerkin method, two-stage method

中图分类号:

U 452

张治国，张孟喜，王卫东. 基坑开挖对临近地铁隧道影响的两阶段分析方法[J]. , 2011, 32(7): 2085-2092.

ZHANG Zhi-guo ，ZHANG Meng-xi ，WANG Wei-dong. Two-stage method for analyzing effects on adjacent metro tunnels due to foundation pit excavation[J]. , 2011, 32(7): 2085-2092.

参考文献

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