FIELD: mining.
SUBSTANCE: during performance of drilling and blasting works in the lower part of each explosive well a bottom charge is arranged, on the outer surface of which there is a circular cumulative groove arranged, the top of which lies in the horizontal plane, which separates the volume of the bottom charge in two and matches the plane of a working site of an open pit ledge or a bottom of an underground stope. The value of well subgrade drilling is accepted as equal to the half of the cumulative groove base width.
EFFECT: reduced drilling flow due to reduction of subgrade drilling and higher quality of arrangement of a working site of open pit ledges and a bottom of stopes at underground mining works.
2 dwg
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