Research Article
Gas Expansion Energy Model and Numerical Simulation of Outburst Coal Seam under Multifield Coupling
| Parameters and units | Value |
| Elasticity modulus of coal /(GPa) | 3 | Elasticity modulus of coal matrix /(GPa) | 8 | Poisson’s ratio of coal | 0.32 | Density of coal /(kg/m3) | 1350 | Elasticity modulus of coal /(GPa) | 30 | Poisson’s ratio of rock | 0.2 | Density of rock /(kg/m3) | 2450 | Cohesion of coal /(MPa) | 1.45 | Friction angle of coal /(°) | 30 | Langmuir pressure constant of coal /(MPa) | 1 | Langmuir constant volume of coal (m3/kg) | 0.02 | Initial matrix porosity of coal | 0.03 | Initial fracture porosity of coal | 0.001 | Initial permeability (m2) | 1e-13 | Gas dynamic viscosity /(Pa·s) | 1.52e-5 | Initial diffusion coefficient /(m2/s) | 5e-11 |
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