Research Article
Study on Multiparameter Precursory Information Identification of the Fracture of Yellow Sandstone
Table 4
Comprehensive index warning table.
| | Numbering of rock samples | Acoustic emission counting (N) | b value | Body strain (%) | Acoustic emission energy | Dissipative energy (kJmāā3) | Average frequency (kHz) | Peak frequency (kHz) | Sample entropy |
| | sz-17 | 19.3 | 20.1 | 11.4 | 10.1 | 7.8 | 8.6 | 3.4 | 2.5 | | sz-18 | 18.7 | 19.6 | 10.6 | 9.8 | 7.7 | 9.1 | 3.1 | 2.7 | | sz-20 | 19.4 | 21.3 | 11.3 | 11.4 | 7.4 | 8.4 | 3.8 | 2.9 | | sz-21 | 18.9 | 22.8 | 12.9 | 12.1 | 7.9 | 8.1 | 3.2 | 3.0 |
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