METHOD FOR EXPLOSIVE DESTRUCTION OF VARIOUS COHERENCE ROCK MASSIF WITH DISTRIBUTED AND SHORTENED BLASTHOLE CHARGES WITH CUMULATIVE EFFECT Russian patent published in 2016 - IPC F42D1/08 F42D3/04 E21C41/26 

FIELD: mining.

SUBSTANCE: invention relates to mining industry, to methods of explosive destruction - blasting various coherence massif. Method involves drilling of main distributed and additional shortened blastholes with cumulative effect, determination during drilling the contour in plan, soil marks and hard inclusions roof, arrangement of explosive substances (ES) in the main and additional shortened blastholes, performing of stemming and blasting. When loading the additional shortened blastholes, at the blasthole bottom a foam plastic cylinder is lowered, the length of which is determined by formula, then a cone is lowered with the diameter equal to the one of the blasthole with the vertex angle from 90° to 30°, herewith the height of the cone is determined by formula, then the ES charge is loaded, the amount of which is calculated by formula. Blasting the distributed ES charges is performed asynchronously with early short-delay-initiation of the upper charge. Blasting ES charge in additional shortened blastholes is performed with short-delay advance from those located near the upper distributed charges.

EFFECT: invention allows improving efficiency of explosion energy use at crushing hard inclusions occurring in less hard rocks.

1 cl, 1 dwg