引水隧洞不良地质洞段开挖施工技术

Excavation technology for construction of diversion tunnel in section with unfavorable geological condition

结合贵州大花水水电站引水隧洞的工程概况，介绍了隧洞开挖施工方法、爆破设计及围岩支护措施，以使隧洞在施工期和运行期具有长期的稳定性，并总结了施工经验。

Combined with diversion tunnel works in Dahua hydropower station in Guizhou the excavation construction method of tunnel is introduced as well as design method for blasting and supporting of surrounding rock. Construction experiences are summarized in order to ensure safety construction and stability of tunnel.