浅埋偏压软弱围岩大断面隧道综合处治措施

摘要

针对某隧道开挖断面大、地质条件差、Ⅳ级、Ⅴ级围岩所占比例大等特点,施工过程中发生过塌方、地表沉降、溶洞、特大溶洞、软弱围岩收敛变形超限,分别采用针对性的综合处治措施,顺利通过了出口长大浅埋偏压地段,取得了十分满意的效果。%According to the features in the construction process of the tunnel,including the large excavation section,the weak geological conditions,the large percentage of Ⅳ-level and Ⅴ-level surrounding rock,the collapses in the construction process,the surface settlement,the karst caves,the super-large karst caves,the overrunning of the convergence deformation of the weak rock and adopts the respective comprehensive treatment measures,so it can go through the exit long and large shallow bias section and achieve the satisfying results.