Question #657063 on Yade changed:
https://answers.launchpad.net/yade/+question/657063

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
The consolidation stage is supposed to be isotropic. If it is isotropic + 
constant volume then there is really nothing happening, the boundaries do not 
move, and the stress is constant.
"But the stress must be increased", you may think. Yes, if you think in terms 
of total stress on a saturated sample in lab tests, but you don't simulate the 
saturating fluid, so what you have for stress in the simulation should be 
understood as effective stress. And of course (do you agree?) the effective 
stress is not changing during a "U" consolidation.
Bruno

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