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 |
|
|
