FIELD: blasting.
SUBSTANCE: breaking is carried out by drilling of wells in the shape of concave arch rotation surface in longitudinal section, besides length of rotation arch chord (H) equals linear size of outsized piece by well length, radius of camouflet effect arch equals (in m) 
where b is distance between wells, m; d is diametre of well, m, and diametre of well expanded part is equal (in m) to 
.
EFFECT: invention makes it possible to provide for even breaking of rocks in blasting unit and to improve efficiency of extraction and loading equipment and transport.
1 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR DIRECTED BREAKING OF ROCKS | 1988 |
|
SU1840800A1 |
| CARTRIDGE FOR DIRECTED BREAKING OF ROCKS | 1988 |
|
SU1840799A1 |
| METHOD FOR BLAST BREAKING OF ROCKS | 1989 |
|
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| DRILLING AND BLASTING OPERATIONS AT OPEN PITS | 2013 |
|
RU2517289C1 |
| METHOD FOR BREAKING OF KIMBERLITIC ROCKS | 2006 |
|
RU2311609C1 |
| CHARGE ES | 1989 |
|
SU1840801A1 |
| METHOD FOR SHOOTING OF ORES AND ROCKS ON UNDERGROUND MINING WORKS | 2011 |
|
RU2476819C1 |
| BLASTING METHOD OF DESTRUCTION OF IRREGULAR BLOCKS | 2015 |
|
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| EXPLOSIVE HOLLOW CHARGE | 2007 |
|
RU2356009C1 |
| OPEN DEVELOPMENT METHOD OF COAL BEDS GROUP WITH GROSS EXPLOSIVE LOOSENING OF OVERBURDEN ROCKS | 2015 |
|
RU2593285C1 |
