Research Article
Rockburst Characteristics and Mechanisms during Steeply Inclined Thin Veins Mining: A Case Study in Zhazixi Antimony Mine, China
Table 3
Rockburst proneness criteria.
| | Criterion | Formula | Empirical value | Correction value | Rockburst intensity |
| | Fissure coefficient () | | >0.8 | >0.75 | Strong | | 0.6∼0.8 | 0.65∼0.75 | Moderate | | 0.55∼0.60 | 0.55∼0.75 | Weak |
| | Brittleness coefficient () | | <14.5 | <16.8 | Strong | | 14.5∼26.7 | 16.8∼25 | Moderate | | 26.7∼40 | 25∼40 | Weak |
| | Tao discriminant index () | | ≤2.5 | ≤4 | Strong | | 2.5∼5.5 | 4∼6.3 | Moderate | | 5.5∼14.5 | 6.3∼11.4 | Weak |
| | Impact energy index () | | >3 | >3 | Strong | | 2∼3 | 1.7∼2.8 | Moderate | | 1∼2 | 1∼1.7 | Weak | | Elastic energy index () | | >200 | >300 | Strong | | 100∼200 | 200∼300 | Moderate | | 50∼100 | 100∼200 | Weak |
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