METHOD OF FORECAST OF LOCATION OF LOWER BOUNDARY OF EXPLOSIVE GAS ZONE IN STOPE Russian patent published in 2015 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: method of forecast of location of lower boundary of explosive gas zone in working face is proposed, comprising the driving of bypass in working area, implementation of well into the top of layer, and measurement of methane concentration along its length by the moving gas metering probe. At that the well into the top of layer is carried out from the junction of lava with adjoining air release working in the direction of the worked-out area of the current working area to placement of immediate mine roof to the length equal to its pitch of placement, at an angle of unloading of roof rocks from moving boundary of the stope. The measurement of methane concentration is made along the length of the well with the forward and reverse movement of gas measuring probe in preassigned intervals of length of the well, and the lower boundary of explosive gas zone is set from the top of layer along the lower concentration limit of explosibility of gas-air mixture.

EFFECT: implementation of the method enables to establish, in each specific case of mining coal bed, the location of the lower boundary of explosive gas zone in the working face in the most dangerous part of it, to make recommendations to eliminate accumulations of explosive gases, and to improve the safety of stoping on the gas factor.