穿越复杂地层超长引水隧洞的开挖及支护

Excavation and Support of Super Long Diversion Tunnel Crossing Complex Stratum

结合工程实际,对穿越断层引水隧洞的开挖及支护技术进行了研究。针对地下隧洞工程量大、断层带区域范围较大、岩石破碎、地质情况复杂、支护难度大的情况,在自稳能力差的围岩洞段,采取“短进尺、弱爆破、强支护”等施工措施,顺利完成了施工。总结的经验可为类似工程提供参考。

Combined with the engineering practice,the excavation and support technology of diversion tunnel crossing fault zone is studied.As to the conditions of large amount of underground diversion tunnel engineering,large area of fault zone,broken rocks,complex geological condition and great support difficulty,the construction measures of"short footage,weak blasting and strong support"are adopted in the tunnel section with poor self stability and the construction is completed smoothly.The summarized experience can provide reference for similar projects.