METHOD FOR HYDRAULIC MINING OF COAL BEDS Russian patent published in 2013 - IPC E21C41/18 E21C45/00 

FIELD: mining.

SUBSTANCE: first preparatory field mines are driven - level haulage and ventilation drifts with identical geodetic elevations, block crossdrifts and accumulating drifts with an inclination for a self-flow transport, stripping wells are drilled at the right angle to the bed plane, then, line cuts are washed by the hydraulic method. Level haulage and ventilation drifts stretch at identical geodetic elevations to form a ventilation scheme with horizontal depression. The area of line cuts is increased to initiate the process of caving of a hanging massif in a stope. The stope bottom is formed by washing of line cuts with an inclination providing for accumulation of caved coal through self-flow. The caved coal is magazined to control shift of side rocks in the stope. Chambers that are adjacent to the mined space are separated by barrier sight pillars. Oversize material is crushed, and coal mass is periodically discharged in dosing manner into the accumulating drift to provide for stope bottom movement up the pitch.

EFFECT: elimination of air leaks through a mined space, reduced contamination of coal by caved rocks, higher reliability of breaking face functioning and labour safety.

2 dwg