Computer-aided design of rational parameters for the location of blasthole charges in horizontal underground development

ABSTRACT The article substantiates a stage-by-stage physical model of destruction of a real rock mass. On its basis, the key results of an explosion in a solid medium were determined: the strength characteristic of rocks under conditions of all-round explosive loading, the relative limiting radius of the blast cavity, the radii of the zones of fine crushing and radial cracks, and the principle of the rational arrangement of charges in the blasted block was formulated. Using this principle, an analytical method has been developed for determining the rational parameters of the location of charges in the face of preparatory workings and their computer-aided design. Experimental explosions carried out in the underground mines of Kazakhmys Corporation LLP confirmed the operability of the proposed automated design of drilling and blasting operations in horizontal underground workings. The proposed results are in good agreement with the data presented in the works of a number of world authors.