METHOD FOR NEUTRALISING THE EFFECT OF ANOMALIES IN THE STATE OF THE ROCK MASS ON MINING Russian patent published in 2022 - IPC E21F5/00 E21C41/26 F42D3/04 

FIELD: mining.

SUBSTANCE: invention relates to a method for neutralising the effect of anomalies in the state of the rock mass on mining. A bunch of rows of converging boreholes is drilled, the boreholes are loaded with an explosive and simultaneously blasted. Said bunch of rows of converging boreholes is drilled by explosion contours of the converging boreholes of a parabolic, concave, linear shape or an equivalent single charge and location thereof. The direction of the explosive effect is determined, ensuring the maximum duration of the explosion pulse by executing short-delay initiation of the rows of boreholes row by row with a gradual increase in the wave energy in the direction the problematic rock massif. The detonation transmission reaches each opposite borehole of the next row by an electronic electric detonator with the calculated deceleration time in the range from 0 to 4 ms or by a detonating cord. The converging boreholes may have different times of row detonation; stretched-pulse explosive compositions such as igdanite or types of high explosives based thereon are used in the boreholes.

EFFECT: creation of an oriented explosive effect on the rock mass by means of combined use of the explosives and the charge structure leading to the formation of a directed blasting mechanism when detonated.

1 cl, 11 dwg, 1 tbl