Pervasive pressure‐solution transfer: A poro‐visco‐plastic model

Stressed quartz sand saturated by water can deform by matter transport through the water phase (pressure solution). This process is modeled by a poro‐visco‐plastic (Voigt‐type) rheology. A characteristic time constant characterizes the transition between Newtonian viscous densification and poro‐plastic 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 poro‐plastic rheology corresponds to a thermodynamic equilibrium at the grain contacts.