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 damageStrain threshold (%)Creep stress (MPa)E1 (GPa)E2 (GPa)η1 (GPa·h)η2 (GPa·h)Failure time (h)

D20.4927.49.380.03806.8141.1223.85
28.48.868.53248.9133.5143.93
29.48.363.52789.9125.384.92
30.48.156.62244.1107.545.02

D30.4327.49.380.03806.8141.1140.51
28.48.868.53248.9133.575.28
29.48.363.52789.9125.327.97
30.48.156.62244.1107.54.47