下穿黄土滑坡体隧道支护体系与变形控制技术研究

Study on Support Structures and Control Technology of Deformation of Tunnel under the Loess Landslide

滑坡的存在给隧道的建设及安全运营带来了巨大挑战,本文以下穿黄土滑坡体客运专线铁路隧道为研究对象,运用MIDAS/GTS建立三维数值模型,研究了有无强降水影响时,“双侧壁导坑–加强型复合式衬砌结构”施工方案对围岩变形及滑坡稳定性的影响,同时结合现场对洞内收敛变形与洞外地表沉降的监测结果,得知“双侧壁导坑–加强型复合式衬砌结构”施工方案对围岩的变形起到了很好的控制作用,上部滑坡体受隧道开挖的影响较小,该方案可为类似工程地质条件的隧道设计和施工提供参考。

The existence of landslide has brought great challenges to the construction and safe operation of the tunnel.The paper takes the tunnel of passenger dedicated railway under the loess landslide as the research object,and a three-dimensional numerical model has been established with MIDAS/GTS.The influence of the construction scheme of“double side wall drift-reinforced composite lining structure”on the deformation of surrounding rock and the stability of landslide was discussed with or without the influence of heavy rainfall.In addition,combined with the monitoring results of the convergence deformation in the cave and the settlement of the surface outside the tunnel,the construction scheme of“double side wall drift-reinforced composite lining structure”has good control effect on the deformation of the surrounding rock.The loess landslide body has less been affected by the tunnel excavation.The scheme can provide reference for the design and construction of tunnels with similar engineering geological conditions.