The Tresca criterion was
originally developed to be used on yield conditions of
metallic materials. In geotechnics, it is often used to
simulate the ground material behavior during undrained
conditions. This model has some flaws when applied to
soil materials, such as no consideration of the effects
of hydrostatic pressure acting on the yield surface. Firstly,
the assumption that shear stress is unrelated to hydrostatic
pressure (or confining pressure) is wrong for general
soil behavior. Secondly, the yield stress is the same
for compression and tension in this criterion, but soils
generally have a much larger compressive strength than
tensile strength, sometimes even negligible tensile strength.
However, performing the total stress analysis for saturated
soils under undrained conditions (called analysis) using
the Tresca yield criterion still gives appropriate results.
The Tresca yield criterion can be used because according
to the results, the shear strength of the saturated soil
is unrelated to the stress comp1nt of the hydrostatic
pressure during undrained loading. In this case, because
the maximum shear stress limit represents the undrained
shear strength, the decision must be made from the results
of the undrained triaxial compression test. |