Research Article
Energy Evolution and Acoustic Emission Characteristics of Sandstone Specimens under Unloading Confining Pressure
Figure 5
Test results of AE ringing counts 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.
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