Research Article
Evaluating Long-Term Strength and Time to Failure of Sandstone with Different Initial Damage
Table 8
Creep parameters and failure time of rock specimens with initial damage D2 and D3 at different creep levels.
| Initial damage | Strain threshold (%) | Creep stress (MPa) | E1 (GPa) | E2 (GPa) | η1 (GPa·h) | η2 (GPa·h) | Failure time (h) |
| D2 | 0.49 | 27.4 | 9.3 | 80.0 | 3806.8 | 141.1 | 223.85 | 28.4 | 8.8 | 68.5 | 3248.9 | 133.5 | 143.93 | 29.4 | 8.3 | 63.5 | 2789.9 | 125.3 | 84.92 | 30.4 | 8.1 | 56.6 | 2244.1 | 107.5 | 45.02 |
| D3 | 0.43 | 27.4 | 9.3 | 80.0 | 3806.8 | 141.1 | 140.51 | 28.4 | 8.8 | 68.5 | 3248.9 | 133.5 | 75.28 | 29.4 | 8.3 | 63.5 | 2789.9 | 125.3 | 27.97 | 30.4 | 8.1 | 56.6 | 2244.1 | 107.5 | 4.47 |
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