引水隧道下穿铁路站场施工方案分析

Analysis on Construction Scheme of Diversion Tunnel Passing through Railway Station and Yard

摘要:

为明确隧道下穿铁路站场时最佳预加固方案，基于数值模拟，分析了超前小导管与超前短管棚两种超前预加固措施效果。结果表明，随着支护刚度的增加，地表沉降、拱顶沉降等不断减小。管棚支护刚度较大，注浆后能形成梁拱效应，有效改善围岩应力状态，控制围岩变形，可作为隧道下穿铁路轨道时超前支护推荐方案。

Abstract:

In order to clarify the best pre-reinforcement scheme when the tunnel passes through the railway station and yard, and based on the numerical simulation, the effects of two advanced pre-reinforcement measures of the advanced small pipe and the advanced long pipe shed are analyzed. The results show that with the increase of support stiffness, the ground surface settlement and vault settlement decrease continuously. The support stiffness of the pipe shed is relatively large, and the beam-arch effect can be formed after grouting, which can effectively improve the stress state of the surrounding rock and control the deformation of the surrounding rock. This scheme can be recommended for the advanced support when the tunnel passes through the railway line.