Study on the Damage Model of Coal Rock Caused by Hydraulic Pressure and Electrical Impulse in Borehole

Table 1

Physical and mechanical parameters of coal-rock mass.

Parameters of rock coal	Bulk density (kN/m^3)	Tensile strength (MPa)	Compressive strength (MPa)	Modulus of elasticity (MPa)	Poisson’s ratio (μ)	Cohesion (MPa)	Angle of internal friction (°)	Coefficient of robustness (f)
	15.15	2.53	19.69	11065	0.30	1.78	35	2.8