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龙厦高速铁路石桥头隧道进口段,采用CRD法进行施工。针对城市浅埋隧道施工引起地表变形是城市浅埋隧道施工中密切关注的问题。本文采用有限差分法,对CRD法施工引起地表变形进行三维数值模拟分析,得到CRD法施工的隧道地表变形规律、衬砌受力分布特点、衬砌受力与围岩变形关系等,并提出施工的注意事项。最后利用实测值与分析预测值进行对比,误差在4mm之内,均未超过地表变形允许值,地表建筑物安全得到了保障,实现了隧道CRD法施工对地表变形的有效控制,对以后类似工程具有一定的指导意义。
Long Xia high-speed railway stone bridge tunnel entrance section, the use of CRD method of construction. The surface deformation caused by the construction of shallow tunnels in urban areas is closely concerned with the construction of urban shallow tunnels. In this paper, the three-dimensional numerical simulation analysis of surface deformation caused by construction of CRD method is carried out by finite difference method. The deformation law of tunnel surface caused by CRD method, the stress distribution characteristics of lining, the relationship between lining force and surrounding rock deformation and so on are proposed. matter. Finally, the measured values are compared with the predicted values. The errors are within 4mm, and the allowable values of the surface deformation are not exceeded. The safety of the surface buildings is guaranteed, and the effective control of the surface deformation caused by the tunnel CRD construction is realized. Has a certain guiding significance.