牛角湾隧道洞口坍塌处理

摘要

Taking the collapse accident at the shallow buried section of Niujiaowan tunnel portal along Yanling-Rucheng expressway as the background,the paper fully indicates the reasons for the tunnel collapses,points out the respective treatment schemes,indicates how to undertake the construction at the multi-arch tunnels,and all the preventions and construction measures to prevent the portal collapses at the places with weak surrounding rock,and sums up the experience from the portal collapse,so as to provide the direction for the similar portal construction with weak surrounding rock in future.%以炎汝高速牛角湾隧道出口洞口浅埋段坍塌事故为背景,全面分析了该隧道塌方形成的原因,提出针对性处理方案;并提出了在软弱围岩处,如何进行连拱隧道洞口施工,防止洞口塌方的各项预防和施工措施,对这次洞口塌方的经验进行了总结,为后续同类软弱围岩洞口施工提供指导。