Multiple choice

In an undrained triaxial test on a saturated clay, the Poisson’s ratio is

  1. $\frac{\sigma_3}{(\sigma_1 + \sigma_3)}$
  2. $\frac{\sigma_3}{(\sigma_1 - \sigma_3)}$
  3. $\frac{\sigma_1 - \sigma_3}{\sigma_3}$
  4. $\frac{\sigma_1 + \sigma_3}{\sigma_3}$
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A Correct answer
Explanation