Multiple choice In an undrained triaxial test on a saturated clay, the Poisson’s ratio is $\frac{\sigma_3}{(\sigma_1 + \sigma_3)}$ $\frac{\sigma_3}{(\sigma_1 - \sigma_3)}$ $\frac{\sigma_1 - \sigma_3}{\sigma_3}$ $\frac{\sigma_1 + \sigma_3}{\sigma_3}$ Reveal answer Fill a bubble to check yourself A Correct answer Explanation