Yanzhula O. Substantiation of the parameters of coal face operations near faults, prone to sudden release of methane

The object of reseaches - geomechanical processes in a coal massif, which contains a geological disturbance in the pulsed release of methane into the face. The purpose of the work is to establish the regularities of methane filtration in the inelastic zone of the reference pressure of the coal seam and substantiate the parameters of treatment works in areas of geological disturbances prone to sudden methane emissions in the face to increase productivity and safety of treatment works. Research methods: analysis of data and generalization of previously performed research, actual material on pulsed methane emissions from the fake stratum and patterns of methane filtration in areas of geological disturbances; phenomenological methods for calculating methane filtration in the coal seam; thermodynamic and molecular-mechanical methods of research of adsorbed methane in coal; analysis and interpretation of the obtained results. For the first time in the filtration of methane in the elastic region of the reference pressure of the coal seam, the effect of methane adsorption by the microporous structure of coal is due to the fact that this microstructure in this region is prone mainly to decompression processes, and the degree of methane filling is 40% thermodynamic assessment of the state of methane adsorbed in coal in a virgin coal massif. For the first time, fundamentally new regularities of methane filtration in the inelastic zone of the reference pressure of the coal seam, taking into account its free and adsorbed phase, are obtained, as methane accumulates in the filter stream bottom to a significant increase in methane pressure compared to the pressure in the filtration stream of the free phase only. Geological criteria are offered and the method of the forecast of impulse gassing of workings at collapses of a roof is developed. Regularities of formation of the zone of the increased aerogas-dynamic danger - "square of the made space" which is characterized by formation of a zone of the main vault of collapse in rocks of a roof are established. Regularities of the filtration process of methane in a coal seam that comfortably accommodates the faulted zone, which saturated free and adsorbed methane with regard to intermolecular interactions in the system of "methane-coal" in conjunction with conformational rearrangements in the microstructure of coal and with the activation energy of the development of desorption processes in the coal when moving stope in close proximity to zones of geologic violations were established in the dissertation. The implementation of these regularities has allowed us to develop methods of safe conducting mountain works in zones of geological faults, which are prone to sudden release of methane in the stope workings, thus improving the safety of mining operations. The results of the studies were included in the "Recommendations for prediction of danger of gas-lading impulse in mining with waste stope from the geological fault zone", "Recommendations for prevent the gas-lading impulse in workings with waste stope from the geological fault zone" and were handed over for use in the Mine Management "Pokrovskoe".