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重庆奉(节)(巫)溪高速公路孙家崖隧道受山体滑坡、连续降雨及三峡蓄水等影响,加之围岩破碎,已施工的隧道初期支护严重变形,侵入二次衬砌,为保证隧道施工的质量及安全,采用工字钢护拱加固原有初期支护,小导管径向注浆,之后进行换拱及二次衬砌作业,该施工方案对类似工程设计和施工有一定的指导和借鉴意义。
Chongqing Feng (Festival) (Witch) Creek Sunjiaya Expressway by mountain landslides, continuous rainfall and the Three Gorges reservoir impact, combined with the surrounding rock crushing, the tunnel has been the construction of the initial support of a serious deformation, invasion of secondary lining, in order to ensure the construction of the tunnel Of the quality and safety of the use of I-beam steel arch reinforcement of the original initial support, a small radial pipe grouting, after the change for the second arch and lining work, the construction program for similar projects have some guidance and design and construction Reference meaning.