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[Diego Abarca <question693568@xxxxxxxxxxxxxxxxxxxxx>]

Question #693568 on Yade changed:
https://answers.launchpad.net/yade/+question/693568

Diego Abarca posted a new comment:
Thank you for your answer Jérôme,

> I think it is the same in (granular) mechanics !

Indeed, from granular mechanics I know that for the shear phase of an
undrained triaxial test there is a family of combinations of initial
stress and void index where it would be expected that stresses drop.
However, in laboratory tests with real soils under these conditions it
would usually happen at larger vertical strains than the strain the
model is experiencing when stresses drop to zero, the final stresses of
the real soil would drop to small but nonzero values, and the effects of
this drop would be smaller when starting from a lower void index.

That was what I was expecting to happen when imposing an undrained
condition by maintaining constant volume. I know this can be done in
YADE as it has been used to simulate soil liquefaction [1], but there
are many things I could be doing wrong as I don't know the specifics of
how this was achieved.

Thank you for your time Jérôme, I hope you have a nice day.

[1] http://lbezone.ust.hk/bib/b1781031, page 46 under figure 4.1.

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