衢宁铁路鹫峰山一号隧道高压富水断层处治技术

Treatment Technology of High Pressure and Water Rich Fault in Jiufengshan No.1 Tunnel of Quzhou-Ningde Railway

针对鹫峰山一号隧道富水断层下穿大型水库、实测水压高达4.3 MPa的工程水文地质特点,通过超前钻孔及孔内成像和同位素示踪试验综合分析,判定断层段地下水与地表水库水存在长期水力联系;通过理论计算分析,提出了隧道穿越高压富水断层带"超前注浆加固、衬砌结构加强、分区防水、安全监测、综合治理"的处理原则和相应的工程处治措施,有效解决了隧道安全施工和结构长期安全问题,对类似工程具有一定的参考和借鉴作用。

According to the engineering hydrogeological characteristics of Jiufengshan No.1 Tunnel with water rich fault under-crossing large reservoir and measured water pressure up to 4.3 MPa,through the comprehensive analysis of advanced borehole,borehole imaging and isotope tracing test,it is determined that there is a long-term hydraulic connection between groundwater in fault section and surface reservoir water.Through theoretical calculation and analysis,the treatment principle and corresponding engineering treatment measures of“advance grouting reinforcement,lining structure strengthening,partition waterproof,safety monitoring and comprehensive treatment”were put forward for the tunnel crossing the high pressure water rich fault zone,which effectively solves the safety construction and long-term safety problems of the tunnel structure,and provides a certain reference for similar projects.