洪家渡水电站2号导流洞进水口岩埂爆破拆除BLASTING DEMOLITION OF ROCK-DYKE AT INLET OF NO 2 WATER-DIVERSION TUNNEL IN HONGJIADU HYDROPOWER STATION
刘美山,李永池,张正宇,吴新霞,张文煊
LIU Mei-shan~(1;2);LI Yong-chi~1;ZHANG Zheng-yu~2;WU Xin-xia~2;
摘要(Abstract)：
洪家渡水电站 2号导流洞进水口岩埂距需保护的闸门仅 9m ,堰外水位高于堰顶 ,岩埂表面及前部存在大量松碴 ,此外拆除岩埂的工期短。在上述困难条件下 ,利用垂直和倾斜的深孔以及微差爆破技术 ,将岩埂一次爆破拆除。本文论述了爆破方案确定、爆破参数选择、起爆网路设计以及爆破安全措施。同时介绍了有关此项工程的经验和体会。
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.
关键词(KeyWords)：
导流洞;围堰;岩埂;拆除爆破
Water-diversion tunnel; Cofferdam; Rocd-dyke; Demolition blasting
基金项目(Foundation):
作者(Authors):
刘美山,李永池,张正宇,吴新霞,张文煊
LIU Mei-shan~(1;2);LI Yong-chi~1;ZHANG Zheng-yu~2;WU Xin-xia~2;