|
| Parameters | Value |
|
| Elastic modulus of coal (, GPa) | 2 [47] |
| Poisson ratio of coal () | 0.3 [47] |
| Bulk modulus of the coal matrix (, GPa) | 7.5 [48] |
| Bulk modulus of the coal skeleton (, GPa) | 8.9 [28] |
| Maximum adsorption-induced volume strain for CH4 () | 0.012 |
| Langmuir pressure of adsorption-induced volume strain for CH4 (, MPa) | 1 |
| Initial cohesion of coal without gas (, MPa) | 0.923 |
| Residual cohesion of coal without gas (, MPa) | 0.692 |
| Friction angle of coal (, ) | 30 [47] |
| Transition value of coal softening parameter (, %) | 2 |
| Bulk density of coal (, kg/m3) | 1300 |
| Bulk density of rock (, kg/m3) | 2500 |
| Elastic modulus of rock (, GPa) | 20 |
| Cohesion of rock (, MPa) | 20 |
| Friction angle of rock (, ) | 40 |
| Poisson ratio of rock () | 0.3 |
| Temperature of coal seam (, K) | 293 |
| Initial permeability of coal seam (, mD) | 0.0025 [38] |
| Initial fracture porosity (, %) | 0.1 [49] |
| Matrix porosity (, %) | 6 [38] |
| CH4 Langmuir volume (, m3/t) | 20 |
| CH4 Langmuir pressure (, MPa) | 1 |
| Adsorption time (, day) | 11.7 [47] |
|
