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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?
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,