Abstract
In Donbas coal mines, coal and gas outbursts present a major risk for the mining operation safety. Rapidly released energy can cause serious damage to the mine’s personnel and production equipment. Modern numerical methods allow modeling complex physical processes occurred during the coal and gas outbursts. The mathematical model was developed for the coupled processes of the rock massif deformation and gas filtration in the mine face near the tectonic dislocation. When solving the problem, the finite element method was used. The calculation results of the stresses, inelastic deformation zones, pressures of methane and configuration of cavity of the coal and gas outburst are represented in the paper. It is shown that an outburst cavity is formed inside the coal seam and is bounded from above and from below by the host rocks. The calculated geometry of the fracture cavity at the gas-dynamic phenomena in the mine working face coincides with actual data obtained in the mines of Donbas and, therefore, confirms the adequacy of the developed mathematical model.
Highlights
Coal and gas outbursts are threatening the safety of mining operations in the coal mines of the central region of Donbas and are one of the main obstacles to the intensification of underground mining and the introduction of new non-traditional and safe technologies for mining coal seams [1, 2]
Both calculated and actual data suggest that in the considered case the outburst cavity is located within the coal seam, from above and below it is limited to enclosing rocks
The vertical section of the fracture cavity has a rectangular shape, possibly with a curved end, the horizontal section is the shape of an irregular ellipse, the major axis of which is perpendicular to the axis of mine working
Summary
Coal and gas outbursts are threatening the safety of mining operations in the coal mines of the central region of Donbas and are one of the main obstacles to the intensification of underground mining and the introduction of new non-traditional and safe technologies for mining coal seams [1, 2]. Modern numerical methods allow to solve complex systems of coupled equations that describe the physical processes occurring during the outburst of coal and gas: the deformation of the coal and rocks, filtration and desorption of gas [3]. They allow you to take into account the properties of the rocks and the geometry of the workings.
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