野三关隧道大型高压富水充填溶腔运营期深化处理技术

宜万铁路野三关隧道在建设期间采用“释能降压、注浆加固、超前支护、结构加强、综合治理”的原则安全处理并顺利通过DK124+602大型高压富水充填溶腔。开通运营近10年来,隧道结构总体稳定,但也发生了强降雨期间溶洞内岩溶水不能及时排放、反灌正洞致中断行车的现象。为进一步降低隧道安全风险,加强排放强降雨期间“+602”溶腔内可能形成的短时高压水,精准实施新增高位排水支洞方案,深化处理溶腔并于2020年汛期取得实效,有效引排了高位岩溶水,确保了宜万铁路的运营安全,为类似工程问题处理提供了借鉴。

Further Process Technology of Large High-pressure Water-rich Filling Karst Cavity of Yesanguan Tunnel in Operation Period

During the construction of Yesanguan Tunnel of Yichang-Wanzhou Railway,safe treatment measures such as energy release and pressure reduction,grouting reinforcement,advanced support,structural reinforcement and comprehensive treatment were taken to successfully filled the DK124+602 large highpressure water-rich karst cavity.With nearly 10 years’operation,the tunnel structure remains stable.However,during a heavy rainfall,karst water in the karst cavity could not be discharged in time,and flowed into the main tunnel and caused traffic interruption.In order to further reduce the safety risk of the tunnel and strengthen the discharge of instantaneous high-pressure water in the"+602"karst cavity during a heavy rainfall,the scheme of an additional high-level drainage adit was implemented to further process the karst cavity,and achieved good results in the flood season of 2020.It effectively discharged the high-level karst water and ensured the operation safety of Yichang-Wanzhou Railway,which provides reference for solving the similar engineering problem.