摘要
宁芜改线项目基坑工程位于南京地铁某隧道的正上方,坑底距隧道顶的距离仅为7.5 m.基坑开挖对地铁隧道影响的分析与计算成为该工程的关键之一,为此建立了该基坑工程的数值分析模型.计算结果表明,基坑开挖对开挖面以下土体具有显著的垂直方向卸荷作用,不可避免地引起坑底土体发生变位,带动土体中的隧道产生位移,同时隧道管片的应力状态也有所改变.其成果可为优化设计和施工提供有益的参考,为类似工程提供借鉴[1].
The excavation of Ningwu change line project is just above the Nanjing subway tunnel. The distance between bottom and the tunnel roof is only 7.5 m. Analysis and calculation on the metro tunnel excavation become one of the keys of the project. A numerical model of the foundation is established. The results show that the excavation lead to significant unloading in the vertical direction, inevitably lead to modification of the soil in the bottom, and drive the tunnel in the soil produce displacement, while the stress state of tunnel segments have changed. The results can be provided to optimize the design and construction and be a useful reference for similar projects.
出处
《兰州工业高等专科学校学报》
2011年第6期39-43,共5页
Journal of Lanzhou Higher Polytechnical College
