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BLASTING DEMOLITION OF ROCK-DYKE AT INLET OF NO 2 WATER-DIVERSION TUNNEL IN HONGJIADU HYDROPOWER STATION

LIU Mei-shan~(1,2),LI Yong-chi~1,ZHANG Zheng-yu~2,WU Xin-xia~2,ZHANG Wen-xuan~2 (1.University of Science and Technology of China,Hefei 230027,China; 2.Yangtze River Scientific Research Institute,Wuhan 430010,China)  
In Hongjiadu Hydropower Station,the rock-dyke at the inlet of No.2 water-diversion tunnel is only 9m away from a lock gate necessary to be protected.The water level outside the cofferdam is higher than the top of the cofferdam.There are a lot of rock residues on surface and front of the rock-dyke.In addition,there is a short time limit for demolition of the rock-dyke.Under above-mentioned difficult conditions,the rock-dyke is demolished by once-through millisecond blasting with vertical and inclined deep-holes.In this paper,the determination of blasting plan,the selection of blasting parameters,the design of firing circuit and safety precautions are expunded.At the same time,the experience and knowledge about this project are introduced.
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