渭河隧道施工对上覆滑坡体扰动影响及施工控制技术研究

以宝兰铁路客运专线渭河隧道下穿北山滑坡体工程为背景，采用数值计算方法分析隧道下穿施工对上覆滑坡体的扰动规律，同时针对有无超前支护措施进行数值模拟分析。数值计算结果表明:隧道施工并未促使滑坡体滑动，仅对滑坡体存在一定影响，超前支护能有效减轻施工对滑坡体的扰动。在得到隧道施工对滑坡体的扰动影响后，制定相应的施工控制技术措施。现场监测数据表明，采用超前支护、三台阶临时仰拱法和径向注浆加固地层的施工控制技术能够保证施工安全。

Study on Perturbation Influence and Construction Control Technology of Weihe Tunnel Construction on Overlying Landslide

The perturbation law of the underpass construction of tunnel to the overlying landslide is analyzed with the numerical computation method based on the project that Weihe tunnel underneath passing the Beishan landslide in railway passenger dedicated line of Baoji-Lanzhou Railway. At the same time, carry out numerical simulation analysis for the presence or absence of advanced supporting measures. The results show that the construction of the tunnel does not promote the sliding of the landslide, but only has some influence on the landslide body. The advanced support can effectively reduce the perturbation of the landslide. The corresponding construction control technology measures are put forward after obtaining the perturbation influence of the landslide body. Field monitoring data show that the construction control technology of advanced support, three-step temporary inverted arch method and radial grouting reinforcement can ensure the safety of construction.