Research Article
Thermo-Hydro-Mechanical Coupling Numerical Simulation on Mechanical Heterogeneity of Coal Rock
| Parameters | Value |
| Initial porosity (decimal) | 0.15 | Initial pore pressure (MPa) | 5 | Poisson’s ratio (decimal) | 0.31 | Skeleton bulk modulus (MPa) | 166 | Elastic modulus (GPa) | 1.85 | Coal rock density (kg/m3) | 1320 | Thermal expansion coefficient (1/K) | | Initial permeability (m2) | | Methane adsorption constant (a/m3/kg) | 14.5 | Methane adsorption constant (b/1/MPa) | 0.72 | Methane adsorption constant (c/kg/m3) | 13.66 | Molar gas constant (J/(mol·K)) | 8.341 | Klingberg coefficient (Pa) | | Gas molar volume (m3/mol) | 0.0224 | Lamé’s constant (λ/GPa) | 1.1521 | Lamé’s constant (G/GPa) | 0.70611 | Methane density (kg/m3) | 0.714 | Gas viscosity (Pa·s) | | Initial temperature (K) | 273.15 | Coal rock temperature (K) | 293.15 | Heat capacity ratio at constant pressure (J/(kg·K)) | 200 |
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