Research Article

Energy Evolution Characteristics and Distribution Laws of Rock Materials under Triaxial Cyclic Loading and Unloading Compression

Figure 5

Relationships of the rock energy density and the strain under triaxial cyclic loading-unloading compressions.
(a) σ3 = 5 MPa
(b) σ3 = 10 MPa
(c) σ3 = 15 MPa
(d) σ3 = 20 MPa
(e) σ3 = 25 MPa
(f) σ3 = 30 MPa