A New Elastoplastic Damage Model for Constitutive Modeling of Argillaceous Formations

This contribution introduces a new elastoplastic damage model dedicated to constitutive modeling of semi-brittle geomaterials like argillaceous formations showing two irreversible phenomena. The model deals with the plastic behavior of such medium by a new thermal variant of Barcelona Basic Model. In addition, micromechanical definition of damage and phenomenological concepts of damage propagation are combined in the framework of Continuum Damage Mechanics (CDM) for damage modeling. Damaged effective stress variables are employed for formulation of elastoplastic behavior laws. Plastic yield surface is a damage dependent one. The model has been implemented in Θ-STOCK Code and the mechanical aspects of the model have been validated by comparing the numerical results with reference experimental results of argillites and results of an elastodamage model

Keywords:

Elastoplastic , Argillaceous Formations , Semi-brittle , Continuum Damage Mechanics