FIELD: mining.
SUBSTANCE: invention relates to mining and, in particular, to explosive breaking of rocks. On the upper surface of the column of the bottomhole material in the wells there installed is an auxiliary cylindrical charge with diameter equal to the diameter of the wells, with a cumulative groove directed towards the bottom of the well, which is initiated after the main charge with deceleration determined by formula Δt=Ls/D (s), where Δt is deceleration, s; Ls is main explosive charge length, m; D is detonation velocity of explosive in main charge, m/s.
EFFECT: higher efficiency of blasting of ores and rocks.
1 cl, 3 dwg
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