Research Article
An Evaluation Method of Rock Brittleness Based on the Prepeak Crack Initiation and Postpeak Stress Drop Characteristics
Table 5
Calculation results of each index for marble under different confining pressures.
| Confining pressure (MPa) | BIBi·Bii | Comparison of brittleness indices | Qualitative analysis of the test curve | B1 | B2 | B3 | B4 | B5 |
| 5 | 0.152 | 0.76 | 0.26 | 1.13 | 0.36 | 0.66 | Brittleness | 15 | 0.110 | 0.39 | 0.21 | 0.83 | 0.47 | 0.65 | Elasticity-plasticity | 25 | 0.082 | 0.20 | 0.10 | 0.31 | 0.52 | 0.88 | Elasticity-plasticity | 35 | 0.078 | 0.19 | 0.13 | 0.45 | 0.48 | 0.63 | Elasticity-plasticity |
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