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分区施工基坑对邻近隧道变形影响的三维有限元分析*
张娇1,王卫东1,2,3,李靖2,3,徐中华2,3
摘 要

(1 同济大学地下建筑与工程系, 上海 200092; 2 华东建筑设计研究院有限公司, 上海 200002;

3 上海基坑工程环境安全控制工程技术研究中心, 上海 200002)

[摘要]上海世博片区绿谷一期深大基坑工程紧邻越江双线盾构隧道,基坑环境保护要求高,基坑采用分区方案实施。以PLAXIS3D有限元软件建立基坑与邻近隧道的三维有限元模型,土体采用HS-Small小应变本构模型,对基坑分区开挖的过程进行了动态模拟。计算结果与实测结果对比表明,采用HS-Small小应变土体本构模型的三维有限元分析能较好地模拟基坑的变形以及基坑开挖对邻近隧道的影响;分区施工方案通过减小单个基坑的规模,充分利用了基坑的时空效应,起到了很好的变形控制作用。

[关键词]三维有限元; HS-Small模型; 变形控制; 分区施工

中图分类号:TU398-7文献标识码:A文章编号:1002-848X(2017)02-0090-06

 

Threedimensional finite element analysis of the impact of zoned excavation on adjacent tunnels

Zhang Jiao1, Wang Weidong1,2,3, Li Jing2,3, Xu Zhonghua2,3

(1 Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 

2 East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China;  

3 Shanghai Engineering Research Center of Safety Control for Facilities  Adjacent to Deep Excavations, Shanghai 200002, China)

Abstract:The foundation pit of Phase I of Lügu project in the Shanghai Expo district is a large and deep excavation. The excavation is adjacent to double line shield tunnels. In order to protect the tunnels, zoned excavation method was adopted for the foundation pit. Three-dimensional finite element analysis was carried out by using PLAXIS3D software to simulate the construction process of the deep excavation. The soils were modeled by using the HS-Small model which can describe the properties of soils at small strain level. Comparison of numerical results and field monitored data shows that 3D FEM analysis can give good prediction of deformation of the excavation and its impact on adjacent tunnels. It is also shown that, zoned excavation of dividing big pit into smaller ones can effectively control the deformation of deep excavation.

Keywords:3D FEM; HS-Small model; deformation control; zoned excavation

 

*上海市浦江人才计划(15P51433500)。

 

作者简介:张娇,博士研究生,Email:survey0936@163.com。

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