| 摘要 |
FIELD: mining industry; may be used in underground mining of ore bodies by level-and-room systems. SUBSTANCE: method consists in that in mining of ore bodies by pillar-and-room system with yielding pillars, slot in the next (adjacent) room is made before provision of yielding the interblock pillar. It is provided by breakage on hanging wall in interblock pillar of trihedral prism by alternating short-delay blasts onto worked-out space of the previous block of hole rings with reduction of width of each subsequent ring, and the last hole in angle of blasted prism is located from boundaries of interblock pillar on the side of adjacent room at the distance of effective radius of hole blast. With rock pressure close to limit one for ore mass, slot in adjacent block is driven from interblock pillar at a distance equalling the thickness of layer broken by one mass blast together with blasting of trihedral prism in interblock pillar. EFFECT: higher safety in mining operations under conditions of high rock pressure, reduced expenditures for full releasing of pillar from pressure. 2 cl, 5 dwg |
