(De)compaction of porous viscoelastoplastic media: Model formulation

A nonlinear viscoelastoplastic theory is developed for porous rate‐dependent materials filled with a fluid in the presence of gravity. The theory is based on a rigorous thermodynamic formalism suitable for path‐dependent and irreversible processes. Incremental evolution equations for porosity, Darcy's flux, and volumetric deformation of the matrix represent the simplest generalization of Biot's equations. Expressions for pore compressibility and...