METHOD OF VENTILATION OF GAS-ABUNDANT BREAKAGE FACES Russian patent published in 2002 - IPC

FIELD: coal mining industry, underground development of gas-bearing and fire hazardous coal seams by long columns along strike. SUBSTANCE: stable ventilation over any length of mining extracted area is achieved by drive of additional ventilation heading along pillar between ventilation heading of developed column and unsupported conveyer heading of adjacent column developed earlier. They are connected by crosscuts. In this case portion of return ventilation current released through worked-out space of adjacent column is directed from worked-out space into additional ventilation heading through open crosscuts ahead of breakage face. Another portion of return ventilation current is discharged through supported headings, main load being carried by additional ventilation heading. Method provides for possibility of discharge of remaining portion of return ventilation current through additional ventilation heading with supply of fresh current through ventilation heading, division of portion of return ventilation current into two currents, one being directed into additional ventilation heading and the other one being directed into ventilation heading and for joining of these two currents in ventilation heading and so forth. EFFECT: stable ventilation over any length of mining extracted area. 5 cl, 3 dwg