Research Article
Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles
Table 4
Bursting energy index of coal under different crack angles.
| Specimen types | Group a | Group b | Group c | Average value |
| Complete cylinder | 20.29 | 21.11 | 16.15 | 19.22 | 0° cracked cylinder | 15.1 | 7.99 | 3.47 | 8.85 | 30° cracked cylinder | 16.34 | 12.6 | 4.36 | 11.1 | 60° cracked cylinder | 20.64 | 11.34 | 11.6 | 14.53 | 90° cracked cylinder | 16.45 | 17.6 | 16.76 | 16.94 |
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