Numerical Modeling on Hydraulic Fracturing in Coal-Rock Mass for Enhancing Gas Drainage

Table 1

Parameters of coal-rock mass for numerical calculation.

Parameters	Values	Parameters	Values
Poisson’s ratio	0.25	Homogeneity index m	1000
Elastic modulus E	6 GPa	Internal friction angle φ	30°
Tensile strength ft	6 MPa	Compressive strength fc	60 MPa