地下水位对青岛地铁盾构隧道变形影响研究

Research on infl uence of underground water table on shield tunnel deformation in Qingdao Metro

以青岛地铁1号线盾构隧道为背景,借助Plaxis 2D有限元分析软件,研究了不同地下水位下盾构隧道周围土体的变形。每个地下水位分开挖完成和注浆完成2种工况进行分析。通过对比不同地下水位、不同工况下隧道周围土体的变形情况,分析地下水对盾构隧道施工的影响,并将分析结果与现场实测结果进行了对比。结果表明,开挖完成时地下水位越高,土体变形越大;注浆完成时,地下水位对土体变形影响较小。

Taking shield tunnel of Qingdao Metro Line 1 as an example,using finite element software PLAXIS 2D,this paper analyzes the deformation of soil around the tunnel with different water tables.The two working conditions of excavation at all different water tables and completion of grouting is numerically analyzed.The infl uence of underground water on the deformation of soil around the tunnel is analyzed by comparing the results of various conditions and the results of numerical analysis are compared with measured data.Results show that the deformation of soil increase with higher water table at the end of excavation,while the infl uence is insignifi cant at the completion of grouting.