Experimental Investigation of Energy Evolution in Sandstone Failure during Triaxial Unloading Confining Pressure Tests

Figure 5

Energy evolution curves of sandstone samples under unloading confining pressure. (a) Energy-time curve (C-7-0.05). (b) Energy-axial-strain curve (C-7-0.05). (c) Energy-radial-strain curve (C-7-0.05). (d) Energy-volume-strain curve (C-7-0.05).

(a)

(b)

(c)

(d)