Coupled hydro-mechanical analysis of compacted bentonite behaviour during hydration

This study analyses the response of compacted bentonites upon hydration based on a coupled hydro-mechanical elasto-plastic framework. As an alternative to multi-porosity interpretation, framework was selected experimental evidence adsorbed water behaviour in and volumetric at saturated states, apparently independent its initial state. Based these premises, retention model formulated using explicit distinction between free water, enabling postulation properties depending In order effectively account for transition unsaturated state, that can occur wide range suctions, stress–strain constitutive equations are written terms effective stress degree saturation The mathematical formulation implemented finite element code used simulate interpret MX-80 bentonite different forms during several paths, including loading unloading cycles after saturation. A good agreement with results obtained consistent set parameters describing state behaviour. typical non-linear swelling pressure development interpreted through two-way coupling compressibility. possible high suctions states explain potential full hydration. Overall, this offers new perspectives role interactions