邻近地铁隧道的基坑群开挖变形分析

Deformation analysis of group excavations adjacent to subway tunnels

随着城市建设的发展,在地铁沿线不可避免的出现深基坑的开挖,为确保既有建筑物的安全,有必要对基坑开挖变形进行研究。结合上海轨道交通七号线静安寺地铁车站基坑工程和越洋广场基坑工程,研究了邻近地铁隧道的基坑群开挖对基坑本身和邻近地铁隧道的影响。采用FLAC^(3D)软件建立了分析邻近地铁隧道的深基坑开挖的三维有限差分数值模型,然后根据实际的施工方案,分析了群坑开挖时邻近地铁隧道的变形规律和基坑地下连续墙的变形性状,最后以隧道变形为例初步分析了基坑开挖引起的位移叠加效应。

With the development of urban construction,deep excavation along the subway is inevitable.It is necessary to study excavation deformation to ensure the safety of existing buildings.Combined with the deep excavation of the Jing'an Temple Station of Shanghai Metro Line 7 and Yueyang Square,the effects of deep excavation on the foundation pits and the adjacent subway tunnels were studied.A three-dimensional finite difference model was established in order to simulate the deep excavation.The deformations of the diaphragm walls and the adjacent subway tunnels were analyzed.Finally,based on a tunnel deformation case,the superposition effect of the displacement caused by excavation was preliminary analyzed.