Research Article
Estimation of Rock Burst Grades Using Rock Mass Strength
Table 14
Various criteria for rock burst estimation
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| Barton’s criterion | Rehman’s criterion | Tao’s criterion | CHEGI’s criterion | Modified criterion in this study | | SRF | Rock burst grade | SRFQ | Rock burst grade | | Rock burst grade | | Rock burst grade | | Rock burst grade |
| 2.5∼5 | 5∼10 | Mild | 5∼10 | Mild | 5.5∼14.5 | Slight | 4∼7 | Slight | >0.167 | Slight | 2.5∼5.5 | Medium | 2∼4 | Medium | 0.066∼0.167 | Medium | <2.5 | 10∼20 | Heavy | 10∼20 | Heavy | 1∼2 | Strong | 0.012∼0.066 | Strong | <2.5 | Heavy | <1 | Violent | ≤0.012 | Violent |
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SRF and SRF Q are stress reduction factor and modified stress reduction factor, respectively. |