Modeling Rock Fracture Propagation and Water Inrush Mechanisms in Underground Coal Mine

Table 2

Some input parameters for the validation case.

Fracture toughness	Mode I (MPa·m^1/2)	1.5
	Mode II (MPa·m^1/2)	3.0
Fluid	Bulk modulus (GPa)	1.0
	Density (kg·m^-3)	1000
	Viscosity (Pa·s)
Rock	Young’s modulus (GPa)	37.5
	Poisson’s ratio	0.25
	Internal friction angle (°)	33
	Cohesion (MPa)	33
	Porosity	0.1