Research Article
Numerical Modeling on Hydraulic Fracturing in Coal-Rock Mass for Enhancing Gas Drainage
Table 2
Parameters of coal-rock mass and water for numerical calculation.
| | Parameters | Values | Parameters | Values |
| | Poisson’s ratio | 0.33 | Initial permeability k0 | 3 × 10−18 m2 | | Elastic modulus E | 3.35 GPa | Initial porosity | 0.05 | | Internal friction angle φ | 30° | Residual porosity | 0.01 | | Compressive strength fc | 40 MPa | Water dynamic viscosity μw | 3.55 × 10−4 Pa·s | | Tensile strength ft | 3 MPa | Bulk modulus of water βl | 2.5 × 109 Pa | | Homogeneity index m | 1000, 20 | Biot coefficient α | 0.8 |
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