岩石地层基坑开挖对下部地铁车站结构的影响

Influence of Rock Foundation Pit Excavation on the Structure of Underground Subway Station

依托重庆轨道交通10号线南坪站及上部基坑开挖工程,采用物理模型试验,分析不同隧道埋深以及基坑分层开挖、岛式开挖和盆式开挖过程中地铁车站结构的变形特征;通过数值模拟对试验结果进行验证,以此分析基坑开挖对下部地铁车站结构的影响。试验结果表明:在上部基坑深度一定时,隧道埋深越大,则基坑开挖对隧道的影响越小;不同的基坑开挖方式对下方隧道的影响存在差别。推荐此类基坑工程采用岛式开挖方案。

Relying on Nanping Station of Chongqing Subway Line No.10 and its upper foundation pit excavation work,through physical model experiment,the influence to subway station structure deformation caused by different tunnel buried depth,and stratification in foundation pit excavation,island excavation and basin excavation have been analyzed.And test results has been verified through numerical simulation to analysis the influence of foundation pit excavation to the lower part of subway station structure.The test results show that when the depth of the upper foundation pit is constant,the greater the depth of the tunnel is,the less the influence of the excavation on the tunnel is.Different excavation methods have different impacts on the tunnels below,so the island excavation scheme is recommended for this kind of excavation project.