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深基坑开挖与邻近隧道相互影响的分析
引用本文:高广运,吴勇,张先林,金清山,冯世进.深基坑开挖与邻近隧道相互影响的分析[J].土木工程学报,2011(Z2):114-117.
作者姓名:高广运  吴勇  张先林  金清山  冯世进
作者单位:同济大学岩土及地下工程教育部重点实验室;上海市规划和国土资源局;上海市岩土地质研究院有限公司;
基金项目:上海市规土局资助项目(FDZ2008034)
摘    要:采用三维快速拉格朗日方法(FLAC3D)模拟软土地区深基坑的分步开挖和支护过程。根据隧道与基坑不同位置关系,分为"紧贴型"和"浅埋型"两类、共7种工况,分析基坑分步开挖对邻近地铁隧道变形的影响以及隧道对基坑连续墙变形和墙后地表位移的影响。数值分析土体采用修正剑桥模型,考虑了连续墙和土体的接触滑移作用。数值分析结果发现隧道变形大小与基坑距离关系并不完全单调,隧道的存在对基坑墙后土体有明显的"加筋效应"。

关 键 词:基坑开挖  相邻隧道  数值分析  修正剑桥模型  三维快速拉格朗日方法

Analysis of the interaction between deep excavation and adjacent existing tunnel
Gao Guangyun Wu Yong Zhang Xianlin Jin Qingshan Feng Shijin.Analysis of the interaction between deep excavation and adjacent existing tunnel[J].China Civil Engineering Journal,2011(Z2):114-117.
Authors:Gao Guangyun Wu Yong Zhang Xianlin Jin Qingshan Feng Shijin
Affiliation:Gao Guangyun1 Wu Yong1 Zhang Xianlin2 Jin Qingshan3 Feng Shijin1 (1.Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji Univesity,Shanghai 200092,China,2.Shanghai Municipal Bureau of Planning and Land Resources,Shanghai 200003,3.Shanghai Geotechnical Engineering and Geology Institute Co.,Ltd.,Shanghai 200072,China)
Abstract:Fast Lagrangian Analysis of Continua in 3 Dimensions(FLAC3D) was employed to simulate stage-excavated and supported foundation pit.According to different locations between tunnel and excavation,two types—’closed-type’ and ’shallow-embedded-type’ and seven conditions can be categorized regarding the analysis of the interaction between deep excavation and the adjacent existing tunnel.Modified Cambridge model was adopted to model the soil behavior.And the interaction between soils and retaining structures was also taken into account in the numerical analysis.The result shows that the deformation of the tunnel is incompletely monotony with the distance from the excavation,and the presence of the tunnel imposes a ’reinforcement effect’ on the soil mass behind the retaining wall.
Keywords:excavation  adjacent tunnel  numerical simulation  Modified Cambridge model  FLAC3D  
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