大跨地铁暗挖车站施工地层变位控制技术研究

在城市中修建地铁暗挖车站,由于开挖跨度大,埋深浅,对地层扰动较大,地表沉降的控制往往成为工程的重点和难点。北京地铁五号线某车站施工时采用数值分析预测、地层变位分部控制,以及信息化施工等措施,成功地将地表沉降控制在设定范围。其研究方法和支护手段,对解决类似大断面暗挖施工具有一定的指导和借鉴意义。

Research on the soil deformation control in the mining construction of large-span metro station

When constructing metro station in city soil layers are always disturbed badly because of the large-span and shallow excavation.Accordingly the control of the surface settlements becomes important and difficult.This paper introduces the construction of a station of Beijing metro,in which realized the control of surface settlements within the predetermined range by using the numerical methods of forecasting,controlling the soil deformation layer by layer,and by monitoring.The research approach adopted by this paper offers certain guidance and reference to similar projects.