Table 2 Results of creep tests for sandstone specimens with different joint inclinations.
Joint inclination (°) | Young's modulus (GPa) | Loading conditions | The first creep | The second creep | The third creep | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
The first stress level (MPa) | Strain increase (10–3) | Test duration (minute) | The second stress level (MPa) | Strain increase (10–3) | Test duration (minute) | The third stress level (MPa) | Strain increase (10–3) | Test duration (minute) | Failure type | |||
0 & 0 | 4.85 | Three-stage creep | 11.67 | 0.379 | 18 | 25 | 1.354 | 18 | 32.84 | 11.845 | 0.73 | Failure during load process |
0 & 30 | 4.48 | Three-stage creep | 11.67 | 0.435 | 18 | 25 | 0.73 | 18 | 34.27 | 10.895 | 1.25 | Failure during load process |
0 & 60 | 3.79 | Three-stage creep | 11.67 | 0.77 | 18 | 25 | 0.54 | 18 | 38.34 | 10.645 | 14 | Accelerating creep |
0 & 90 | 5.54 | Three-stage creep | 11.67 | 0.25 | 18 | 25 | 0.729 | 18 | 33.98 | 11.25 | 1.97 | Failure during load process |
