| 紧邻运营地铁进行基坑施工的影响因素研究 |
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| 引用本文： | 张治国,徐晨. 紧邻运营地铁进行基坑施工的影响因素研究[J]. 上海理工大学学报, 2016, 38(1): 69-75 |
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| 作者姓名： | 张治国 徐晨 |
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| 作者单位： | 上海理工大学 环境与建筑学院, 上海 200093;重庆交通大学 山区桥梁与隧道工程国家重点实验室培育基地, 重庆 400074;上海理工大学 环境与建筑学院, 上海 200093 |
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| 基金项目： | 上海市自然科学基金资助项目(15ZR1429400);山区桥梁与隧道工程国家重点实验室培育基地开放基金资助项目(CQSLBF-Y15-1) |
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| 摘 要： | 基于上海地区某深基坑工程施工方案,建立了紧邻运营地铁隧道的基坑开挖变形影响的有限元数值模型,重点分析了基坑围护支撑的数量和位置、基坑土体加固、地铁隧道位置、隧道下卧层土体和地下连续墙刚度对基坑周边地层以及隧道变形的影响.结果表明:基坑围护支撑数目及位置的选择对周边地层和隧道变形产生影响较大;隧道的存在对土体沉降具有"遮拦效应",在一定程度上能够减少坑外土体沉降;增加下卧层土体模量和地下连续墙的刚度可减少坑外地表沉降,有效控制地铁隧道的变形.
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| 关 键 词： | 基坑开挖 支撑数量和位置 隧道位置 土体模量 地下墙刚度 影响因素 |
| 收稿时间： | 2014-12-21 |
Influencing Factors of Foundation Pit Excavation Adjacent to Operating Metro Tunnel |
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| ZHANG Zhiguo and XU Chen. Influencing Factors of Foundation Pit Excavation Adjacent to Operating Metro Tunnel[J]. Journal of University of Shanghai For Science and Technology, 2016, 38(1): 69-75 |
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| Authors: | ZHANG Zhiguo and XU Chen |
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| Affiliation: | School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China;School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | Based on a deep foundation pit engineering construction scheme in Shanghai, a finite element model was established to study the deformation effect of excavation on operating metro tunnels.The factors, including the number and position of foundation pit supports, foundation pit reinforcement, position of tunnels, sub-layer soil stiffness and the diaphragm wall stiffness, were focused to analyze their effects on surrounding strata and tunnel deformation.The results show that the number and position of supports have a significant impact on the surrounding strata and tunnel deformation.The existence of tunnels may have a "sheltering effect" on soil settlements and thereafter reduce the settlements of ground outside the foundation pit.The increase of sub-layer soil modulus and stiffness of diaphragm wall can reduce the settlements of ground outside the foundation pit and effectively control the tunnel deformation. |
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| Keywords: | foundation pit excavation number and position of supports tunnel position soil modulus diaphragm wall stiffness influencing factors |
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