GROUP DEEP-HOLE OUTBURST CHARGE Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: invention refers to blasting operations. Group deep-hole outburst charge includes a number of separate deep-hole charges 2 of explosives. Parts 3 (lower charge) and 5 (upper charge) of separate deep-hole charge 2 are separated by ground partition 4. Stemming 6 of hole made of ground is placed above upper charge 5 up to surface of ground. Intervals between parts of change and distances between holes are determined from relations: Δ_оpt= 0,22 (S_t·Q)^1/3, n = 6,1 · Δ_opt· (n + 1)/n, where S_t is shorting-through index of rock, Q is mass of charge, kg; 0.22 is specific consumption of explosive, m/kg; n is factor of action of blast given in description of invention. EFFECT: enhanced efficiency of deep-hole outburst charge. 4 dwg, 1 tbl