Research Article
Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths
Table 4
Fractal values of AE of samples under different time ratios.
| Time ratio | Scheme I | Scheme II | Scheme III | 10 MPa | 20 MPa | 40 MPa | 50 MPa | 10 MPa | 20 MPa | 40 MPa | 50 MPa | 10 MPa | 20 MPa | 40 MPa | 50 MPa |
| 0.2 | 1.33 | 0.96 | 1.34 | 1.34 | 1.21 | 0.71 | 0.69 | 1.10 | 0.79 | 0.69 | 0.82 | 0.58 | 0.4 | 1.26 | 1.10 | 1.36 | 1.30 | 1.24 | 0.66 | 0.69 | 1.21 | 0.56 | 0.51 | 0.95 | 1.11 | 0.6 | 1.16 | 0.78 | 1.39 | 1.41 | 1.13 | 0.16 | 0.66 | 1.06 | 0.51 | 0.43 | 0.87 | 1.02 | 0.8 | 1.19 | 0.76 | 1.32 | 1.41 | 1.34 | 0.26 | 0.86 | 0.78 | 0.64 | 0.64 | 0.91 | 0.95 | 1.0 | 1.24 | 0.51 | 1.34 | 1.40 | 1.12 | 0.69 | 0.30 | 0.31 | 0.66 | 0.11 | 0.36 | 0.08 |
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