Influence of Deviatoric Stress on the Deformation and Damage Evolution of Surrounding Rock under Unloading Conditions

Figure 8

Evolution of AE hits in whole tests process for specimens under different initial confining stress ((a) and (b) 10, (c) and (d) 20, and (e) and (f) 30 MPa).

(a)

(b)

(c)

(d)

(e)

(f)