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

Figure 3

Peak stress of water shock.

(a) 3 MPa hydrostatic pressure and 7 kV voltage

(b) 3 MPa hydrostatic pressure and 9 kV voltage

(c) 1 MPa hydrostatic pressure and 11 kV voltage

(d) 3 MPa hydrostatic pressure and 13 kV voltage

(e) 3 MPa hydrostatic pressure and 11 kV voltage

(f) 4 MPa hydrostatic pressure and 11 kV voltage

(g) 6 MPa hydrostatic pressure and 11 kV voltage

(h) 8 MPa hydrostatic pressure and 11 kV voltage