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

Figure 9

Breaking state of an electropulse at 100 μs on the surface of granite at confining pressures of (a) 0 MPa; (b) 12 MPa; (c) 23 MPa; and (d) 34 MPa.

(a)

(b)

(c)

(d)