An Electro Breakdown Damage Model for Granite and Simulation of Deep Drilling by High-Voltage Electropulse Boring

Table 1

Microscopic parameters of the granite particle model [43].

Parameter units	Value	Parameter maturity	Value	Parameter	Value
Particle density (kg/m^3)	2660	Intergranular contact modulus (GPa)	6.53	Tensile strength (MPa)	15
Cohesion (MPa)	20	Friction angle (°)	45	Friction coefficient of particles	0.5
Porosity	0.2	Normal-shear stiffness ratio	2.5	Parallel-link radius coefficient	1