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(a) Permeability measurements on Carrara marble gouge at constant applied normal stress (σn = 21 MPa) and different values of pore fluids pressure, Pf, resulting in different effective normal stresses, σ’n, and pore fluid factor λ = Pf/σn. (b) During velocity steps, the fluid pressure and the upstream intensifier displacement remain constant, indicating fully drained boundary conditions.
