四川安谷水电站勘探竖井及试验平硐施工工艺

Construction Technology of Exploration Shaft and Test Adit of Hydropower Station in Sichuan

摘要:

四川安谷水电站勘探竖井所处地层河床砂卵石层深厚，采用传统的人工挖掘护壁或沉井施工工艺，施工难度大。针对地层的特点，采用冲击钻机成孔的方式施工。同时，在竖井中开挖试验平硐，遵循多炮眼、小进尺、小药量，光面爆破的施工方案，圆满完成试验平硐的开挖。介绍了其施工技术及注意事项。

Abstract:

The sand-and-cobble layer of river bed is thick in the exploration shaft of Angu hydropower station of Sichuan, the construction was difficult to use traditional wall protection by manual digging. According to the formation characteristics, boring was constructed with percussion drill. And test adit was dug in the shaft, following the construction of scheme of more blast hole, small scale of drilling footage, small charge and smooth blasting.