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I don't know if it is common in YADE to have negative values for the
deviatoric stress q in both triaxial test and triaxial test water for
the first iterations (numerical problem) until the specimen is
stabilized. I have also always had this sudden fall in the value of
sigma22 after some iterations at the beginning of my simulations.
Shall I take the initial value of sigmaisocompactation near to value of
the confining pressure to avoid such problem ?