西秦岭特长隧道穿越F_6断层破碎带施工技术

Construction Techniques for the Extra-Long West Qinling Tunnel Passing Through an F_6 Fault and Fractured Zone

西秦岭特长铁路隧道围岩地质构造复杂,断层较为发育,且处于高地应力区域,因此施工难度较大。在隧道通过断层破碎带施工过程中由于采用了超前地质预报、全程监控量测以及超前小导管预支护、帷幕注浆、三台阶爆破法等技术措施和施工工艺,取得了稳步掘进的效果,有效地防止了塌方等事故的发生,为断层破碎带施工积累了经验。

The construction of the West Qinling extra-long railway tunnel was very difficuh since the geological structure of the surrounding rock is complex, the fault is developed, and it is located in a zone under high ground stress. Stable excavation was achieved during the construction passing through the fault and fracture zone thanks to advance geological forecasting, monitoring and measuring, pre-support with small pipes, curtain grouting, and three-bench blasting, all of which prevented any collapsing.