以我国西部省份某运营隧道仰拱厚度不足的处理为工程背景,通过对该隧道Ⅳ级、Ⅴ级围岩段的典型断面仰拱问题进行数值模拟分析,并对在两种围岩条件下因仰拱厚度不足对隧道围岩位移、塑性区分布以及支护结构受力的影响进行了对比分析,提出了针对仰拱厚度不足情况下的加固补强方案,作出了病害处理的经济分析,从而指导了该隧道的病害处理,并取得了良好的效果。 Based on the background of insufficient thickness of inverted arch in a certain operation tunnel in the western part of China, numerical simulation analysis of the typical arch inversion of Ⅳ and Ⅴ surrounding rock sections of this tunnel is carried out. Inverted thickness of the tunnel on the surrounding rock displacement, plastic zone distribution and the impact of supporting the structure of the force were compared, proposed against the thickness of the invert arch reinforcement programs, made an economic analysis of disease treatment, thus Directed the tunnel disease treatment, and achieved good results.