红土田电站引水隧洞破碎岩层开挖与衬砌

红土田电站引水隧洞地质条件极为复杂,主要分布第四系坡积、崩塌堆积体并夹砂土,厚度5~45 m,隧洞开挖难度大,开挖方案确定按照＂杆超前、后开挖、弱爆破、短进尺、强支护、早封闭、勤量测＂的原则进行隧洞施工的总体方案,洞身开挖采用交叉中隔壁法施工,通过采用该方法施工,最终确保了隧洞施工的安全、工程质量和施工进度均达到业主的要求.

Excavation and Lining in Collapse Rocks of Diversion Tunnel

Hongtutian Diversion Tunnel,under complex geological conditions,distributes mainly in slope deposits,collapse debris and clip sands of the quaternary system,with the thickness of 5～45 m.The excavation difficulty coefficient asks for an overall constructing scheme based on the principles such as lead stem,after excavation,weak blasting,short footage,strong support,early closure and ground measurement.The approach of alternate-bay construction in the hole body is introduced in order to ensure the construction safety and engineering quality within the proper construction schedule by the owner.