Research Article
Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles
Table 2
Uniaxial compressive strength of coal under different crack angles.
| Specimen types | Group a (MPa) | Group b (MPa) | Group c (MPa) | Average value (MPa) |
| Complete cylinder | 17.97 | 21.01 | 20.4 | 19.79 | 0° cracked cylinder | 10.86 | 9.22 | 10.53 | 10.2 | 30° cracked cylinder | 10.89 | 11.66 | 10.19 | 10.91 | 60° cracked cylinder | 15.95 | 13.1 | 10.85 | 13.3 | 90° cracked cylinder | 17.68 | 17.51 | 23.01 | 19.4 |
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