The Choice of Explosion Parameters for Obtaining Specified Pre-Collapse of a Rock Mass

Abstract

When performing Stripping operations, it is not rational to spend energy on regrinding waste rock. in this case, it is sufficient to achieve a total value of the pre-destruction intensity coefficient equal to one. The explosion must be performed separately in each well with large decelerations. The study of the effect of the borehole grid showed that with an increase in the distance between the axes of wells from 4 to 8 m, the mass of the charge increases twice, and the number of wells on a block of 1000 m2 decreases by 3.75 times. Due to the greater intensity of reducing the number of wells, the cost of charging explosives for the entire block with a large grid is reduced by 1.9 times, the cost of drilling operations is reduced, and the productivity of drilling and blasting operations is increased. In the case of mining a mineral, for example, iron ore, which is subsequently crushed during processing, it is rational to use the energy of the explosion for grinding, since the mechanical methods of crushing the ore by crushers and especially by mills are incomparably more energy-intensive. By increasing the power of the explosion (the radius of the zone of destruction of wells), you can significantly increase the pre-destruction of rocks, achieving a uniform set of grinding.