Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths

Figure 14

Failure of rock roof under the unloading with different confining pressures: (a) 10 MPa, (b) 20 MPa, (c) 30 MPa, (d) 40 MPa, and (e) 50 MPa.

(a)

(b)

(c)

(d)

(e)