Worked Examples
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Example 1: A UU test is carried out on a saturated normally consolidated clay sample at a confining pressure of
3 kg/cm2.The deviator stress at failure is 1 kg/cm2.

(a) Determine its total stress strength parameters.
(b) If another identical sample is tested at a confining pressure of 4 kg/cm2, what will be the vertical axial stress at failure?

Solution:

(a)
From the plot, note that fUU = 0 and

(b)
UU tests on identical samples yield the same failure deviator stress at all confining pressures.
Therefore, the vertical axial stress at failure,

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