摘要
引水隧洞进水口岩塞位于水面以下13m处,其直径为5 2m。由于岩塞的直径和厚度相对较小,故采用了钻孔爆破法。岩塞中心布置掏槽孔,周边布置预裂孔,掏槽孔与预裂孔之间布置断面扩大孔。文中介绍了各种炮孔的药量计算、电爆网路的设计、爆破震动和冲击波安全距离的验算以及安全防护措施。爆后进水口的断面尺寸达到了设计要求。
The rock plug in water inlet of a diversion tunnel is located under wa ter level by 13 meters and has a diameter of 5 2 meters Due to the relatively small diameter and thickness of the rock plug, the drilling and blasting metho d is used The cut boreholes are arranged in the center of the rock plug, the pre splitting holes in the periphery and the reliever holes between the cut borehole s and the presplitting holes In this paper, the calculati on of charge weights for every variety of holes, design of electric blasting cir cuit, check of the permitted distances for blasting vibration and shock wave and safety precautions are introduced After blasting, the confi guration of the water inlet is in line with the design requirements
出处
《工程爆破》
2003年第2期69-72,共4页
Engineering Blasting
关键词
引水隧洞
进水口
岩塞爆破
掏槽孔
预裂孔
断面扩大孔
Underwater blasting
Rock plug blasting
Deep hole blasting
Electr ic blasting circuit
