不良地质条件下隧洞施工锁口的几种方法

Several Methods to Tunnel Locking Under Unfavorable Geological Condition

隧洞进出口开挖,由于覆盖层较薄,难以靠围岩的弹性抗力作用达到自身稳定的要求,因此隧洞进洞锁口施工是隧洞施工的关键,尤其在不良地质条件下,如锁口施工工法选择不当,将可能产生冒顶而无法成功进洞。本文以贵州省蒙江双河口水电站工程几条隧洞进洞锁口方法为例,介绍了在不良地质条件下成功进洞的施工方法,以供工程技术人员参考。

Tunnel locking engineering is the key role of tunnel engineering for the thin covering soil around the entrance that can＇t keep the tunnel＇s stability. Under unfavorable geological condition, roof fall would happen if incorrect construction methods were adopted, resulting in not being capable of entering. Corresponding examples in Shuanghekou hydropower station on Mengjiang River of Guizhou province were introduced.