Deformation of Gas-Bearing Rocks and Gas Filtration During Excavation of Mine Workings

Numerical modeling of the coupled processes of deformation of the coal massif with s mine working and gas filtration in the disturbed area was carried out. The modeling takes into account changes in rock permeability depending on their stress state. Cases of a frame supported or roof bolted working are considered. Inelastic strain zones, distributions of stress fields, strains, permeability coefficients, and gas pressure are determined. Curves of changes in geomechanical and filtration parameters over time are presented. The results are analyzed. It is shown that roof bolting can be used not only to maintain the stable state of mine workings but also as a technological means of reducing methane emissions into the mine atmosphere.