Research Article
Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths
Figure 3
Curves of axial stress difference and count rate with time in sandstone failure process under various confining pressures in Scheme I.
(a) 10 MPa |
(b) 20 MPa |
(c) 40 MPa |
(d) 50 MPa |