Triaxial Test
1. In a triaxial test, the stress that acts equally in all directions before the deviator stress is applied is called:
2. The rubber membrane used in a triaxial test serves what primary purpose?
3. A 'Drained' triaxial test implies that:
4. The 'critical state' of a soil in a triaxial test is reached when:
5. Which pore pressure parameter 'A' is characteristic of a normally consolidated clay at failure?
6. The pole (or origin of planes) on a Mohr circle is used to find:
7. A clay soil sample is tested in a triaxial apparatus in consolidated drained (CD) conditions at a cell pressure of 100 kN/m². What will be the excess pore water pressure at a deviator stress of 40 kN/m²?
8. A conventional drained triaxial compression test on a normally consolidated clay (c=0) has σ3 = 200 kPa and σd = 400 kPa at failure. Determine the effective friction angle (φ').
9. In a CU test, the deviator stress at failure was 150 kPa with σ3 = 200 kPa. If the pore pressure at failure was 50 kPa, the effective minor principal stress (σ3') is: