Research Article
Numerical Simulation of Gas-Solid Coupling in Pressure-Relief Gas Drainage of Short-Distance and Underprotective Steeply Inclined Coal Seam Mining
| Model parameter | Parameter values | Unit |
| Original gas pressure of No.2-1 coal seam, | 1.35 | MPa | Original gas pressure of No. 1-8 coal seam, | 0.35 | MPa | Original gas content of No. 2-1 coal seam, | 9.50 | m3/t | Original gas content of No. 1-8 coal seam, | 3.42 | m3/t | Initial permeability of coal seam, | 0.092 | mD | Diffusion coefficient of pore system in coal seam, | | m2/s | Gas dynamic viscosity, | | PaS | Gas density under standard conditions, | 0.714 | kg/m3 | Adsorption constant, | 30.286 | m3/t | Adsorption constant, | 0.375 | MPa-1 | Molar volume of gas, | 0.0224 | m3/mol | Molar mass of gas, | 0.016 | kg/mol | Standard atmospheric pressure, | 0.10 | MPa | Initial porosity of coal, | 8.022 | % |
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