MPL; sigma_total. Updates in the PL.
Avoid ambiguity in MPL, where the stress
variable is used for effective stress and total stress.
The new variable is used in the MPL's property failure index dependent permeability.
Avoid ambiguity in MPL, where the stress
variable is used for effective stress and total stress.
The new variable is used in the MPL's property failure index dependent permeability.