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Strictly speaking, in 2D it is a yield line, not a surface (you would have to do a £D plot for that).

In order to construct a deviatoric yield surface plot you require the triaxial data for a sample for at least three differing confining pressures.

You will then essentially be creating a series of mohr circle plots (shear stress vs Sigma1 - Sigma3) of the deviatoric stress circles at the failure stress of the samples.

A straight line is then drawn that touches the upper bounds of the three circles without passing through them.

This line is the 2D deviatoric yield plot.

There is free software available that will do this for you.

Please see the related links.

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