既有地铁隧道上方明挖基坑施工方案分析
刘长宝邹金杰彭加强
Analysis of Open-cut Foundation Pit Construction Scheme-above Existing Metro Tunnel
LIU ChangbaoZOU JinjiePENG Jiaqiang
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作者信息:中国电建集团华东勘测设计研究院有限公司，310014，杭州
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Affiliation:Power China Huadong Enginecring Co.， Ltd.，310014，Hangzhou，China
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Key words:
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DOI:10.16037/j.1007-869x.2019.06.030
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中图分类号/CLCN:TU94+1
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栏目/Col:施工技术
摘要:
明挖基坑施工对邻近地铁隧道的影响是工程设计和施工中的难点。 选取杭州市延安路至仁和路过街通道基坑开挖作为工程案例，采用三维有限元分析的方法，针对地铁隧道上方浅覆土工况，基坑开挖中采用地基加固、分期开挖等技术方案以减少对既有地铁隧道的影响，提出门式框架加固、分期开挖及控制降水等保护措施。研究结果表明，施工期各监测数据稳定合理，数值模拟与现场实测数据基本吻合，基坑开挖保护措施切实有效。
Abstracts:
The influence of open-cut excavation on the nearby metro tunnels is one of the difficulties in engineering design and construction. A three-dimensional finite element（FEM） method is used to analyze a practical project of cross-road foundation pit in Hangzhou metro. In view of the shallow soil above the metro tunnel，the implementation of foundation reinforcement，staged excavation and other technical schemes in the foundation pit excavation is discussed，in order to reduce the engineering influence on the existing tunnels. At the same time，protection measures like portal frame reinforcement，stratified partition excavation and control precipitation are put forward. The research shows that the detected data are stable and reasonable during the construction，the numerical simulation and field measurement data are basically consistent，proving the effectiveness of the protection measures.
引文 / Ref:
刘长宝，邹金杰，彭加强.既有地铁隧道上方明挖基坑施工方案分析[J].城市轨道交通研究，2019，22(06):133.
LIU Changbao，ZOU Jinjie，PENG Jiaqiang.Analysis of open-cut foundation pit construction scheme-above existing metro tunnel[J].Urban Mass Transit，2019，22(06)：133.
LIU Changbao，ZOU Jinjie，PENG Jiaqiang.Analysis of open-cut foundation pit construction scheme-above existing metro tunnel[J].Urban Mass Transit，2019，22(06)：133.
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