Numerical response of coal seam deformation and gas migration coupled system

In order to reveal the complex coupling effect between the coal seam deformation and the gas migration during coal mining, a dynamic model named coal seam deformation and gas migration coupled system is established based on porosity and gas pressure. Theoretical analysis and numerical simulation with computer programming are respectively used to study the motion of low-gas coal seam, high-gas coal seam, and outburst coal seam The permeability distribution and the time history plot of gas emission were given. The result of numerical calculation shows that the coal seam deformation and gas migration instability will not take plce in both the low-gas coal seam and the high-gas coal seam. The stable values of gas emission are 0.2 m3/min and 4.8 m3/min, respectively. The system is instable in the outburst coal seam as the gas emission keeps increasing. The numerical response results of the coupled system based on the explicit fast Lagrange with computer programming are close to the practice.