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In the consolidated undrained triaxial test on a saturated soil sample, the pore water pressure is zero:
1. During shearing stage only.
2. At the end of consolidation stage only.
3. Both at the end of consolidation and during shearing stages.
4. Under none of the above conditions.

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Correct Answer - Option 2 : At the end of consolidation stage only.

Consolidated undrained (CU)Triaxial test 

  • There are two stages of Shear test
  1. Consolidation stage: In this stage, Confining pressure (σc ) is applied.
  2. Shearing stage: In this stage, Deviator stress (σd ) is applied.
  • Key features of CU triaxial test
    1. In CU test, drainage is allowed during application of confining pressure (σc) and the specimen is fully consolidated by allowing drainage and it is ensured by observation that no further drainage occurs after sufficient time under the applied pressure, Hence the pore water pressure is zero at the end of the consolidation stage.
    2. The specimen is then allowed to shear when consolidation is over.
    3. During shearing stage, drainage line is closed and the soil sample is sheared by application of deviator stressat failure: σd = σf).
    4. uf is the pore pressure generated within the soil specimen due to deviator stress at failure.
    5. CU triaxial test provides the shear strength parameters for total stress analysis (c, Φ) as well as effective stress analysis (c', Φ').

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