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现代金属露天矿的爆破工作,是以中爆破为主,其次是大爆破,二者合称之为大量爆破.大量爆破之后,计划爆破的矿石或岩石未被崩碎,而突出于采掘面之上,谓之硬根底.从理论上说,大量爆破后的硬根底是不应有的.如采用回转式穿孔机在岩根穿凿水平炮孔爆破,完全可以避免硬根底的发生.但这种凿岩方法的工作效率低、生产成本高.现代金属露天矿是使用冲击式穿孔机中爆破或竖井大爆破.由于矿床地质底复杂性以及生产作业底特殊性,实际爆破作业的结果,很难避免
Demolition of modern metal open-pit mine blasting is mainly in the main, followed by a large blast, the two collectively referred to as a large number of blasting after a large number of blasting, the blasting of the ore or rock is not expected to collapse, but prominent in the mining face On the so-called hard foundation theoretically speaking, a large number of hard base after blasting should not have, such as the use of rotary piercing machine piercing horizontal hole blasting can completely avoid the hard bottom of the occurrence, but this kind of chisel Rock work efficiency is low, the production cost is high.Modern open-pit metal mining is the use of percussion piercing machine blasting or shaft blasting.Because of the complexity of the geological bottom and the bottom of the production operation, the actual blasting results, it is difficult to avoid