Cam-Clay plasticity. Part V: A mathematical framework for three-phase deformation and strain localization analyses of partially saturated porous media

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Dynamics of porous media at finite strain (2004, background): “However, if the fluid itself is a mixture of liquid and gas, then the overall bulk modulus of the fluid mixture could be several orders of magnitude lower than the bulk modulus of the liquid alone due to the high compressibility of the gas voids [ 30 ], thus limiting the validity of the latter assum”
ACMEG‐TS: A constitutive model for unsaturated soils under non‐isothermal conditions (2008, background): “In the framework of the generalized effective stress (Equation (2)), Borja [54] proved that including suction in the argument of the yield functions is motivated by thermodynamic considerations.”
Mathematical framework for unsaturated flow in the finite deformation range (2014, methodology): “To describe the expansion of the cap with decreasing Sr , we use the notion of bonding variable [81] and write [13]”
On the mechanical energy and effective stress in saturated and unsaturated porous continua (2006, methodology): “and s for unsaturated soils (van Genuchten, 1980) that could even lead to a non-convex yield function ( Borja, 2004; Wheeler and Sivakumar, 1995).”