施工技术 2013年9月上 38 CONSTRUCTION TECHNOLOGY 第42卷第17期 D0I:10.7672/8gjs2013170038 大断面隧道支撑拆除与二衬施工影响分析 李凌宜 (北京市公路桥梁建设集团有限公司，北京100068) [摘要]在隧道二衬施工时，常规做法均为拆除1段临时支撑，施工1段二衬，此做法安全性较高，但施工场地有 限，影响施工进度.采用专业有限元软件MIDAS/GTS和现场监测，对长沙地铁某区间大断面暗挖隧道的临时支撑 拆除与二衬施工时机相互间的影响进行了分析及现场实施，得出可以采取先行拆除2个施工段的临时支撑， 然后再隔段随拆撑随二衬施工，既可以节省施工时间，也可以保证施工安全. [关键词]隧道工程；大断面隧道；支撑；衬砌；拱顶沉降；施工技术 [中图分类号]U455.91 [文献标识码]A[文章编号]1002-8498(2013)17-0038-03 Influence Analysis of Support Demolition and Secondary Lining Construction for Large Cross-section Tunnel Li Lingyi Beijing Roads Bridges Construction Group Co.Ltd. Beijing 100068 China) Abstract:The regular method of secondary lining is secondary lining construction after temporary supports demolition of one construction section which can ensure safety but effect construction progress.Using finite element software MIDAS/GTS and field monitoring the author analyzes influence of temporary supports demolition and secondary lining construction in large cross-section metro tunnel in Changsha to obtain the method of firstly secondary lining construction after all temporary supports demolition of two construction section and secondary lining construction at the first section and temporary supports demolition at the three section which can save time and ensure construction safety. Key words:tunnels;large cross-section tunnels;supports;linings;crown settlement;construction 1工程概况 为研究对象，对大断面隧道拆除临时支撑及二衬施 长沙市轨道交通2号线湾镇站站前停车线区 工的最合理时机进行研究. 间位于枫林一路与湾路交叉口，设计共4种断面， 表1C型隧道结构形式 最大断面为双线C型断面.与C型隧道相邻为...
大断面隧道支撑拆除与二衬施工影响分析.pdf
