随着露天开采深度加大,硬岩和含水岩体的穿爆量也增多。穿孔效率下降,昂贵牙轮钻头寿命降低以及稀缺抗水炸药的用量比例增大,在使用基本穿爆工艺的情况下这都会导致大大提高材料费和恶化技术经济指标。就此而论,能补充基础穿爆工艺和旨在实现改变待采岩体自然性能想法的一些方案如利用预先爆破的作用,都具有重大实际意 As the depth of open pit mining increases, the amount of piercing of hard rock and watery rock mass also increases. Perforation efficiency decreased, expensive roller cone drill bit life reduction and the proportion of the amount of scared anti-explosives increased, in the case of basic wear and tear technology will lead to greatly increase the material costs and deterioration of technical and economic indicators. In that connection, some of the options that complement basic blasting techniques and those intended to change the natural behavior of the rock mass to be mined, such as the use of pre-blasting, are of great practical significance