I am running into one difficulty. When I calibrate the parameters to match the shear stress–shear strain loops, the excess pore-pressure ratio rᵤ rises too quickly; but when I calibrate to match the rᵤ evolution, the stress–strain response no longer matches. I cannot satisfy both at once. Could you advise on the likely cause and how you handled this in your calibration?
I am running into one difficulty. When I calibrate the parameters to match the shear stress–shear strain loops, the excess pore-pressure ratio rᵤ rises too quickly; but when I calibrate to match the rᵤ evolution, the stress–strain response no longer matches. I cannot satisfy both at once. Could you advise on the likely cause and how you handled this in your calibration?