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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

Correct answer: at the end of consolidation stage only

Solution

In a consolidated undrained triaxial test, the pore water pressure is zero at the end of the consolidation stage because the soil has fully consolidated and excess pore water pressure has dissipated, allowing the effective stress to be fully mobilized before shearing begins.

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