Research Article
Energy Evolution and Acoustic Emission Characteristics of Sandstone Specimens under Unloading Confining Pressure
Figure 6
Test results of AE accumulative ringing of rock specimens under unloading confining pressure. (a) The initial value σ3 = 5 MPa. (b) The initial value σ3 = 10 MPa. (c) The initial value σ3 = 15 MPa. (d) The initial value σ3 = 20 MPa.
(a) |
(b) |
(c) |
(d) |