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莫斯科矿业学院矿岩物理及过程教研室曾经对爆破过程中炮孔的布置对矿体应力状态的质和量的影响进行了理论上的研究。研究结果表明,炸药威力相同,炸药的长度较小时,其作用范围较大。由此可以得出必须使炸药的配置接近于球形的结论。在孔的下部进行扩孔的方法可以部分地满足这一要求。同时发现,经过下部扩孔的炮孔与没有扩孔的炮孔相比,在爆破时大大地强化了剪应力的作用。在这种情
The influence of the placement of blasting holes on the quality and quantity of the ore body stress state has been theoretically studied in the Division of Minerals and Physics, Moscow Mining Institute. The results show that the dynamite has the same power, and the smaller the length of the explosive, the greater its scope of action. From this it can be concluded that the configuration of the explosive must be nearly spherical. The method of reaming in the lower part of the hole can partly meet this requirement. At the same time, it was found that the blasting hole passing through the lower reaming hole greatly enhanced the effect of shearing stress when blasting, compared with the hole without reaming. In this situation