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

Figure 6

Radial deformation during unloading stage and maintaining after unloading. The unloading stage of different initial confining stress ((a) 10, (b) 20, and (c) 30 MPa) lasted for 6 s, 10 s, and 12 s, respectively. The maintaining stage of which lasted for 480 s.

(a)

(b)

(c)