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松潘县牟尼沟隧道地处高原高寒地区,地质条件极其复杂,施工难道大,在施工过程中,地表下沉日变化量及累计沉降量都较大,现有规范中规定的监测项目不能满足该隧道所要掌握的水平位移变化趋势。针对此情况,增加了地表水平位移的监测,结合水平位移和竖向位移的监测数据,掌握了隧道地表整体位移变化情况。根据监测数据,施工中采取了洞口反压土回填、临时仰拱预加固、超前排水等多项措施,成功的限制了水平位移和竖向位移的继续发展,使得隧道施工过程中的险情消除在隐患出现之前。
Songni County Munigou Tunnel is located in the alpine region of the plateau, the geological conditions are extremely complex, the construction is not large, during construction, the surface subsidence changes and the cumulative settlement are large, the existing norms in the monitoring project can not meet The tunnel should grasp the horizontal displacement trend. In view of this situation, the monitoring of the horizontal displacement of the surface is added. Combined with the monitoring data of the horizontal displacement and the vertical displacement, the overall displacement of the tunnel surface is grasped. According to the monitoring data, a number of measures such as backhole backfilling by holes, temporary arch pre-reinforcement and advanced drainage were taken during construction, which successfully limited the continuous development of horizontal displacement and vertical displacement and eliminated the danger in the process of tunnel construction. Hidden problems before.