Characteristics of Stress, Crack Evolution, and Energy Conversion of Gas-Containing Coal under Different Gas Pressures

Figure 11

Changes of the number of cracks in gas-containing coal during deformation and failure.

(a) 0 MPa

(b) 1 MPa

(c) 2 MPa

(d) 3 MPa

(e) 4 MPa

(f) 5 MPa