METHOD FOR DEVELOPING MINE WORKINGS AND CONDUCTING STOPING OPERATIONS Russian patent published in 2017 - IPC E21C37/06 F42D1/08 

FIELD: mining engineering.

SUBSTANCE: method of developing mine workings and conducting stopping operations includes drilling of cut and periphery wells (holes). The operations are carried out in two stages. At the first stage, the cut wells (holes) of depth equal to 1…1.2 of the periphery wells depth (holes) are drilled according to a preset blasting scheme. Then transverse hydraulic fracturing is carried out in rock mass through the cut well (hole), cutting off the blasted block from the main rock mass. Longitudinal hydraulic fracturing is carried out through periphery wells (holes), dividing basic rock mass into blasted blocks with size preset by the blasting scheme. Prior to commencing hydraulic fracturing operations in the cut well (hole), cutting of transversal initiating slit is carried out. Longitudinal initiating slits are cut in periphery wells (holes). At the second stage, after the hydraulic fracturing, explosive charge is set in the drilled wells (holes) according to a structure allowing to blast with reduced impact. The blocks formed by hydraulic fracturing are separated from main rock mass or mechanical impact on the blocks is applied, providing opening of transversal and longitudinal cracks of hydraulic fracturing and breaking possible bridges therebetween. The blocks blasted in the result of explosion or mechanical impact are transported along the workings to surface.

EFFECT: reduced volume of drilling work, reduced amount of explosive used.

1 dwg