Conditions for a start of sudden coal and gas outbursts in the breakage faces of coal mines

Theoretical studies of the conditions of a start of sudden coal and gas outbursts in the breakage faces of coal seams were carried out and, as a result, expressions for the gradients of the active and passive forces of a sudden outburst were obtained. Their ratio makes it possible to determine the potential for the occurrence of this gas-dynamic phenomenon by the calculation method. On this basis, by means of mathematical transformations, a structural indicator was obtained, which allows the real outburst hazard of the coal mass to be directly monitored at the face, using operational methods for instrumental determination of the parameters characterizing its gas-dynamic state.