Pervasive pressure-solution transfer: a poro-visco-plastic model

Stressed quartz sand saturated by water can deform by matter transport thro ugh the water phase (pressure solution). This process is modeled by a poro- visco-plastic (Voigt-type) rheology. A characteristic time constant charact erizes me transition between Newtonian viscous densification and pore-plast ic deformations. For short-time scales, the viscous densification is either controlled by interface kinetic or by the diffusivity of the solute Si(OH) (4) at the grain contacts. For long-time scales, the pore-plastic rheology corresponds to a thermodynamic equilibrium at the grain contacts.