Research Article
Numerical Assessment on Unloading Disturbance and Gas Extraction in Remote Distance Protective Layer Mining
Table 4
Calculation parameters for gas extraction simulation.
| | Parameters | Values | Parameters | Values |
| | Langmuir constant, | 1.41 MPa | Langmuir constant, | 0.0228 m3/kg | | Poisson’s ratio, | 0.21 | Coal elastic moduli, | Pa | | Elastic moduli for coal matrix, | Pa | Adsorption time, | 1 d | | Methane molar mass, | 0.016 kg/mol | Coal density, | 1300 kg/m3 | | Ambient temperature, | 293 K | Ideal gas constant, | 8.314 J/(mol·K) | | Langmuir strain constant, | 0.004 | Dynamic viscosity of gas, | 1.081 × 10-5 Pa·s |
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