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黄登水电站1号导流洞进口围堰上部为C20混凝土,下部为地质结构发育的岩埂,周围保护物较多,其中进水塔和闸门距离围堰最近距离仅0.59m。为确保被保护物安全,比较了水平和垂直两种布孔方案,水平孔可以充分利用向上的临空面,对保护物的安全更有利。据此确定了水平孔的布孔方案,高单耗、低单响的设计原则,并对爆破参数进行了详细设计。采用高精度非电雷管起爆系统,爆破取得圆满成功。爆堆形状合理,爆破飞石及爆破振动没有对进水塔及闸门槽产生破坏,起爆后立即实现分流,稳定分流比达到95%。
The inlet cofferdam of No.1 diversion tunnel of Huangdon Hydropower Station is C20 concrete, while the lower part is rock 埂 with geological structure. There are many surrounding protection objects, of which the nearest watercylinder and gate are only 0.59m away from the cofferdam. In order to ensure the safety of the objects to be protected, the two kinds of horizontal and vertical layout schemes are compared. The horizontal holes can make full use of the upward facing free surface, which is more favorable for the safety of the protection object. Based on this, the design principle of the hole layout of the horizontal hole, the high unit consumption and the low single sound are determined, and the blasting parameters are designed in detail. Using high-precision non-electric detonator detonation system, blasting achieved complete success. Blast pile shape is reasonable, blasting rock and blasting vibration did not damage the inlet towers and gate troughs, shunt immediately after detonation, steady diversion ratio reached 95%.