Research Article
Coal Seam Gas Extraction by Integrated Drillings and Punchings from the Floor Roadway considering Hydraulic-Mechanical Coupling Effect
Table 1
Relevant parameters for numerical simulation.
| | Parameter | Value | Parameter | Value |
| | Coal seam initial gas pressure(, MPa) | 1.0 | Formation temperature(, K) | 300 | | Gas adsorption volume constant (, m3/kg) | 0.0266 | Adsorption gauge factor (, kg/m3) | 0.06 | | Gas adsorption pressure constant (, MPa) | 0.568 | Gas molar mass(, g/mol) | 16 | | Gas dynamic viscosity (, Pa·s) | | Molar gas constant (, J/(mol·K)) | 8.314 | | Hydrodynamic viscosity(, Pa·s) | | Standard temperature (, K) | 273.5 | | Gas desorption time (, d) | 1.21 | Standard atmospheric pressure (, kPa) | 101 | | Initial coal porosity () | 0.035 | Coal density (, kg/m3) | 1410 | | Initial fissure degree of coal () | 0.012 | Initial permeability (, m2) | | | Slippage factor (, MPa) | 0.36 | Coal Poisson’s ratio () | 0.35 |
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