溪洛渡水电站泄洪洞补气竖井开挖施工

Excavation of vent shaft of discharge tunnel of Xiluodu Hydropower Station

以溪洛渡水电站右岸泄洪洞龙落尾补气竖井施工为例,针对施工过程中可能遇到的难点问题,提出了采用反井钻开挖竖井的施工方法,即先进行导井施工,然后扩孔进行全断面施工,扩孔开挖采取小药量乳化炸药爆破扩孔,并对开挖效果进行了分析,指出施工过程中的控制要点。结果表明:采用反井法钻进辅以爆破开挖方法有利于降低施工难度,加快施工进度。

Taking the excavation of vent shaft in tail section of discharge tunnel in right bank of Xiluodu Hydropower Station as an example,and considering the problems which may arise during construction,we propose the construction methods of shaft excavation construction,present the construction procedure,analyze the excavation effects and advance the key control points during construction.The results indicate that the construction difficulties can be reduced and the construction process can be accelerated in engineering practice.