METHOD FOR ROCK BLASTING Russian patent published in 1996 - IPC

FIELD: mining industry. SUBSTANCE: method for rock blasting includes drilling of holes 2 in rock mass 1 groups with, at least, three holes in each group. Holes 2 are spaced from one another at distance of not in excess of half the length of pneumatic cartridge 3. Pneumatic cartridges 3 are blasted in group of holes 2 successively by round cycle. After blasting, pneumatic cartridge 9 next in cycle is installed with displacement inside rock mass 1 along line of holes 2 at distance of not in excess of pneumatic cartridge length L relative to blasted cartridge 5. The given technology makes it possible, after blasting of each pneumatic cartridge, to have free surface for rock blasting at distance of not in excess of line of the least resistance from cartridge. EFFECT: higher efficiency. 3 dwg