|
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] |
|