Exchange of matter between the clay clusters (solid phase) and pore water (fluid phase) implies changes in the thermomechanical state of the porous medium. Both elastic and elastic-plastic properties are affected. Chemical effects act reversibly on the plastic properties by increasing or decreasing the preconsol-idation stress and also by changing the shear-strength. But by the same token, they also implicitly trigger or prevent plastic strains. The analysis addresses the situation where the chemical dissolved in pore water does not dissociate, excluding electrical interactions.
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