基坑开挖对地铁隧道及高架基桩的影响分析

Impact of Foundation Pit Excavation upon Metro Tunnel and Viaduct Foundation

摘要: 随着城市轨道交通的发展，使得大量基坑工程与地铁结构相邻，由此引起的环境岩土问题日益突出，地铁结构对变形控制要求极其严格，为此，需采取有效措施使基坑施工对地铁结构的影响减小。论文针对广州南沙某邻近地铁四号线由高架转入地下隧道过渡段的基坑设计及施工，应用有限元方法，研究了基坑施工对既有地铁结构的影响，其分析结果可为优化设计和施工提供有益参考，为以后类似的工程实践提供积累经验。

Abstract: With the development of urban rail transit, which makes lots of foundation pit engineering and metro adjacent structures, the resulting environmental and geotechnical problems have become increasingly prominent, and subway station structure of deformation is extremely strict. Thus, it is necessary to take effective measures to make the foundation pit construction reduce the influence of metro structure. This research in this paper, by means of the field monitoring of a foundation pit construction near changeover portion from elevated structure to underground tunnel of Guangzhou Metro Line 4, using finite element analysis method, researched the foundation pit construction on the influence of metro structure. The result provides valuable reference for design and construction. It is helpful to other similar projects.