Influence of Confining Pressure Unloading Rate on the Strength Characteristics and Fracture Process of Granite Using Lab Tests

Figure 11

AE characteristics of granite under different confining pressure unloading rates. (a)  = 0.002 MPa/s. (b)  = 0.02 MPa/s. (c)  = 0.2 MPa/s.

(a)

(b)

(c)