Numerical study of influence of adsorbed gas filtration and diffusion on dynamic phenomena in a coal seam

The connected physical-mechanical model of gas-saturated coal seam with explicit taking into the account the processes of filtration and diffusion of the gas mixture in the pores of the solid skeleton has been proposed. The developed model as been verified on the basis of experimental data on desorption of CO₂ from the sample of brown coal (lignite). An anomalous increase in strength and deformation capacity of gas-saturated coal sample during uniaxial loading in a certain range of pressure of gas in pores has been revealed. It has been shown that in this pressure range the destruction of the samples occurs with the formation of a large number of small fragments that can serve as a model of gas-dust emission into mine area.