Energy Dissipation and Damage Evolution Characteristics of Shale under Triaxial Cyclic Loading and Unloading

Figure 6

Axial stress-strain and energy evolution curves under cyclic loading and unloading. (a)  = 10 MPa. (b)  = 15 MPa. (c)  = 20 MPa. (d)  = 30 MPa.

(a)

(b)

(c)

(d)