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重庆奉节至巫溪高速公路上古隧道施工期间多次出现突涌水,其中部分段落涌水发生在支护衬砌完成之后,对已完成的支护衬砌造成了严重破坏。结合隧址区地层、构造、水文地质特征及突涌水的特点,对二次衬砌溃口原因进行了分析,研究了可能的处理方案,提出了“以排为主”的原则,主泄水洞与支泄水洞相连通的处治方案。泄水洞的实施,连通了岩溶管道,避免了因岩溶管道堵塞造成衬砌周围水压增大,引起二衬破坏的风险。由于泄水洞主要连通的是岩溶管道,同时采取了一定的限排措施,泄水洞的实施对地下水环境影响较小。
During the construction of the ancient tunnel from Fengjie in Chongqing to Wuxi-Wuxi Expressway, water inrush occurred many times, and some of the gushing water occurred after the completion of the support lining, causing serious damage to the completed support lining. Combined with the characteristics of strata, structure, hydrogeological features and water inrush in the tunnel area, the reason of secondary lining breach is analyzed, the possible treatment scheme is studied, the principle of " Cave and branch drainage tunnel connected to the treatment program. The implementation of the drainage hole connected with the karst pipe and avoided the risk of the lining lining being damaged due to the increase of water pressure around the lining due to the blockage of the karst pipe. Due to the karst pipe is mainly connected with the drainage hole, certain restriction measures are taken at the same time, and the implementation of the drainage hole has less impact on the groundwater environment.