FIELD: mining industry at blasting operations in flooded rocks. SUBSTANCE: holes of the first phase for two benches are drilled in the rock block, then each of them is expanded with formation of a cavity in the form of a truncated cone in the upper part of the lower bench turning into a hollow cavity. The lesser base of the truncated cone is directed to the face, and the height of the expanded part of the hole in the lower bench does not exceed its three maximum diameters. After removal of mud from the expanded cavities of holes breaking holes are drilled. Then all the expanded cavities of the holes of the first phase and the breaking holes are charged with explosive, and the rocks are broken. EFFECT: reduced expenditures connected with drilling and blasting operations in flooded rock masses, cheaper types of explosives are used at charging. 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR DRYING AND CHARGING OF HOLES | 1999 |
|
RU2168701C1 |
| METHOD FOR DUST SUPPRESSION AT MASS BLASTINGS OF HOLES IN OPEN CUTS | 2000 |
|
RU2168700C1 |
| METHOD OF WATER REDUCTION AT EXPLOSIVE PREPARATION TO EXTRACTION OF WATERED MASSIF | 2018 |
|
RU2685722C1 |
| PROCESS OF BREAKING OF ROCKS ON EARTH SURFACE BY BLAST | 1995 |
|
RU2095746C1 |
| METHOD OF BREAKING DOWN ROCK IN QUARRIES | 1985 |
|
SU1343930A1 |
| METHOD OF BLAST ORE BREAKING OFF MASS OF LAMINATED TEXTURE (VERSIONS) | 2004 |
|
RU2263278C1 |
| METHOD OF CHARGING OF DESCENDING BLAST HOLES WITH HOT-FLOWING WATER-CONTAINING EXPLOSIVES | 1994 |
|
RU2100773C1 |
| METHOD OF SLOT GROUND WATER LEVEL LOWERING ON OPENCASTS | 2001 |
|
RU2187649C1 |
| METHOD FOR PRODUCTION OF CHARGE FOR EXPLOSIVE CRUSHING OF ROCKS | 2004 |
|
RU2274827C1 |
| PROCESS OF ARRANGEMENT OF HIGH WALLS IN OUTLINE OF STRIPPING | 2002 |
|
RU2224110C1 |
