METHOD FOR BLASTING DIFFERENT-STRENGTH ROCK MASSES IN THE PERMAFROST ZONE Russian patent published in 2022 - IPC F42D3/04 F42D1/08 

FIELD: mining industry.

SUBSTANCE: invention relates to the mining industry, and in particular to methods of explosive blasting of rocks from an array, and in particular to methods of blasting different-strength rock masses in the permafrost zone in open pit mining. The method for explosive breaking of rocks from a massif includes drilling blast holes, determining in the process of drilling the presence of zones of permafrost, seasonally thawed layer and talik layers, location depth and their thickness, marking the contours in the plan and marking the roof and soil of these zones along the depth of the holes, loading wells dispersed and placed in the indicated zones with explosive charges, the diameter of which is equal to the diameter of the wells, placement of inert gaps between explosive charges to prevent detonation transmission, placement of fighters in explosive charges, and detonation of explosive charges. In this case, in the zone of the seasonally melted layer 1 and the talik layer 2, ice cylinders 6 are coaxially located in the center of the explosive charge, and the rest of the space is filled with explosive 5, 14, and to ensure coaxiality, the ice cylinders 6 have guides 12, while the militants 13 in the explosive charges 14 in the zones of the seasonally thawed layer 1 and the talik layer 2 are connected to the corresponding charges in the permafrost zones 3 by detonation conductors 9, for example, a detonating cord or a shock wave tube, while the charges 14 with ice cylinders 6 in the zone seasonally thawed layer 1 and talik zone 2 are detonated simultaneously from instantaneous detonators, and charges 5 in permafrost zone 3 - from detonation conductors 11.

EFFECT: increasing the efficiency and uniformity of crushing of different strength massifs by increasing the zone of controlled crushing in permafrost while blocking the leakage of explosive gases into the seasonally thawed layer and talic layers.

2 cl, 2 dwg