The idea underlying the construction of a "cluster" charge is the division of the amount of explosives used for a single large-diameter hole among 2-16 parallel close-lying holes (2-10 hole diameters apart), firing being carried out simultaneously or with specific delays [1-2].It has been found that the intensity of the shock waves and stress waves is determined by the total charge energy [3] and the construction of the charge [4].The effect of charge construction on shotfiring characteristics and performance has been known for a long time, for example in connection with the use and study of cumulative-effect charges. "Cluster" charge design comprises the selection of the optimum distance between close-lying holes, the control of the diameter and number of holes in the cluster, and the different arrangements of these holes ('square-grid', "triangular-grid", "pairs" of adjacent holes, "parabolic', "circular ~, etc. ).
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