Effect of Confining Pressure on Mechanical and Energy Conversion Properties of Gas-Containing Coal under Loads

Figure 9

Changes in the number of cracks during deformation and failure of gas-containing coal under different confining pressures.

(a) 0 MPa

(b) 2 MPa

(c) 4 MPa

(d) 6 MPa

(e) 8 MPa

(f) 10 MPa