METHOD FOR DESTRUCTION OF ROCKS Russian patent published in 1999 - IPC

FIELD: mining industry, applicable at mining of ore and non-metallic mineral resources with employment of drilling and blasting operations. SUBSTANCE: the method comprises drilling of borehole, installation of detonators in it connected to a detonating cord, placement of an explosive charge in the borehole, tamping the charge into the hole for blasting the explosive charge. The invention is featured by the fact that not rectilinear but zigzag or spiral laying of detonating cord is used in tamping. The distance between the extreme points of projections of bending (spiral) onto the plane perpendicular to the borehole axis is not less than the diameter of the channel formed in the tamping by blasting of the detonating cord. The zigzag or spiral channel formed in the tamping is blocked by tamping material due to the pressure exerted on the lower part of tamping of gaseous products of explosive blast, which prevents their "shooting" through the channel. EFFECT: increased time of action of gases on the rock to be destructed, reduced specific consumption of explosive at a preset degree of rock crushing, or enhanced quality of crushing at an invariable specific consumption of explosive.