Research Article
Multifield Coupling Mechanism of Unloading Deformation and Fracture of Composite Coal-Rock
Table 1
The physical parameters of the mechanical, thermal, and electromagnetic materials involved in the model solution.
| | Physical parameters | Coal | Rock | Air |
| | Density (kg/m3) | 1450 | 2400 | — | | Bulk modulus (GPa) | 1 | 4.5 | — | | Shear modulus (GPa) | 0.8 | 3 | — | | Specific heat capacity (J/(kg·k)) | 1130J | 916.9 | — | | Thermal conductivity (w/(m·k)) | 1 | 2.8 | — | | Thermal expansion coefficient (°C) | 6.435 × 10−6 | 6 × 10−6 | — | | Poisson’s ratio | 0.25 | 0.22 | — | | Resistivity (Ω·m) | 550 | — | — | | Relative permeability (m/d) | 1 × 10−6 | — | 1.256 × 10−6 |
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