浅埋暗挖黄土隧道围岩变形控制研究

Research into the Deformation Control of Shallow Loess Tunnel

依托某浅埋暗挖黄土隧道,应用MIDAS软件建立三维数值模型,采用弹塑性方法和摩尔库伦准则进行模拟。数值模拟三台阶七步预留核心土法施工引起的围岩变形和初期支护的力学性能。在此基础上,采用超前管棚支护法对隧道围岩进行预加固,通过对比分析了超前管棚加固对围岩变形控制的效果。

Combined with one shallow loess tunnel project,a 3D model is established by soft -ware MIDAS, numerical simulation on the deformation control of the surrounding rock of the tunnel is carried out with elastic -plastic method and Mohr -coulomb yielding criteria. It numerically simulates excavation and support by three -bench and seven -step to reserve core soil construction method to analysis of the deformation and stress condition of surrounding rock stress and the mechanical properties of primary supporting. Base on this, lead pipe -shed support is adopted to reinforce surrounding rock. The effects of the lead pip -shed support is presented by comparing with the original construction method.