Stress path A and stress path B: testing stages and time
| Stage | Initial stress | Target stress | Time |
|---|---|---|---|
| Stress path A | |||
| Consolidation | |||
| Isotropic consolidation | p′ = 50 kPa | p′ = 150 kPa | 15 min |
| Creep | p′ = 150 kPa | p′ = 150 kPa | 15 min |
| Anisotropic consolidation | p′ = 150 kPa | p′ = 172 kPa, q13 = 64 kPa, Kc = 0·7 | Ramped over 30 min |
| Creep | 15 min | ||
| Rotation of α and change of b | 15 min | ||
| Undrained shearing or CSD stage | |||
| Undrained shearing | — | Constant α and b | 2% γzθ per hour |
| CSD stage | — | Constant q, α and b | 5 kPa p′ reduction per minute |
| Stress path B | |||
| Consolidation | |||
| Anisotropic consolidation with simultaneous rotation of α and change of b | p′ = 50 kPa | p′ = 172 kPa, q13 = 64 kPa, Kc = 0·7 | Ramped over 90 min |
| Creep | 15 min | ||
| Undrained shearing or CSD stage | |||
| Undrained shearing | — | Constant α and b | 2% γzθ per hour |
| CSD stage | — | Constant q, α and b | 5 kPa p′ reduction per minute |
| Stage | Initial stress | Target stress | Time |
|---|---|---|---|
| Stress path A | |||
| Isotropic consolidation | 15 min | ||
| Creep | 15 min | ||
| Anisotropic consolidation | Ramped over 30 min | ||
| Creep | 15 min | ||
| Rotation of | 15 min | ||
| Undrained shearing or CSD stage | |||
| Undrained shearing | — | Constant | 2% |
| CSD stage | — | Constant | 5 kPa |
| Stress path B | |||
| Anisotropic consolidation with simultaneous rotation of | Ramped over 90 min | ||
| Creep | 15 min | ||
| Undrained shearing | — | Constant | 2% |
| CSD stage | — | Constant | 5 kPa |
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