隧道仰坡滑塌后初期支护加固与整治技术研究

摘要

受地质、水文和地表排水不畅的影响,隧道洞门段大多处于风化严重、围岩软弱或超浅埋等不利地段,施工过程中极易发生局部滑塌等事故,造成安全风险,是隧道施工中比较多见且容易忽视的问题.通过介绍某高速公路隧道施工过程中仰坡滑塌后造成的隧道初期支护破坏情况,讨论洞门段既有初期支护加固与整治技术以及施工监控量测在指导工程整治的应用情况,相关结论可为同类工程提供参考.%Affected by geological, hydrological and land drainage, tunnel portal sections are mainly in bad areas such as severe weathering, weak surrounding rock or shallow buried, so it's easy to occur that local slide and higher security risk in tunnel construction process, and such accidents can be seen often but more easily be ignored in projects. The initial support damage caused by upward slope collapse in a highway tunnel are introduced, and the retrofit and repairment technology for existing initial support at tunnel portal sections and construction monitoring application are discussed also in the paper, the relevant conclusions can be referenced for similar practice.