基坑开挖对邻近地铁车站运营安全影响研究

Research on the Impact of Foundation Pit Excavation on the Safety of Adjacent Subway Station

以邻近广州地铁13号线某车站的基坑开挖为例,采用有限元模拟方法,分析基坑开挖各工况及基坑降水对地铁车站结构的变形、受力影响。研究表明,拟建项目基坑施工期间,地铁车站结构水平位移极值为2.287 mm,弯矩增量为26 kN·m,增幅为3.87%,当降水至基坑底以下0.5 m时,车站结构最大水平位移为1.391 mm,最大竖向位移为-1.502 mm。数值模拟可客观反映车站结构受力和变形的规律,能量化基坑开挖对车站的影响程度,为基坑设计、施工和监测提供信息反馈。

Takes the excavation of a foundation pit near a station of Guangzhou Metro Line 13 as an example,and uses the finite element simulation method to analyze the deformation and stress of the subway station structure under various conditions of the foundation pit excavation and precipitation.The research shows that during the construction of the foundation pit,the extreme value of the horizontal displacement of the subway station structure is 2.287 mm,the bending moment increment is 26 kN·m,and the increase is 3.87%.When the precipitation reaches 0.5 m below the foundation pit bottom,the largest horizontal displacement is 1.391 mm,and the maximum vertical displacement is-1.502 mm.The numerical simulation can objectively reflect the law of force and deformation of the station structure,energy the impact of foundation pit excavation on the station,and provide information feedback for foundation pit design,construction and monitoring.