When replacing a material set that does not allow for input of an overconsolidation (like the Linear Elastic (LE) model or Mohr Coulomb (MC) model) with an advanced model that allows for input of an overconsolidation (like for example the Hardening Soil (HS) model) in PLAXIS 2D AE, the (isotropic) overconsolidation ratio OCR gets “automatically” initialized at a value of 1.25. Note that:
This behaviour is unexpected and may lead to unrealistic results.
This issue is now solved since PLAXIS 2D 2015.00: the OCR for these clusters is now initialized at 1.0
For PLAXIS 2D AE there is no work around possible other than trying to prevent this situation.