I am trying to reproduce some Triaxial data from Coop et al. (1995) using the Hypoplastic Model with Intergranular Strain Concept on Triax.
So far, I cannot get a decent match for the normally consolidated clay. There seems to be a compromise between getting a resonable stress path and a resonable shear stiffness curve. Can you please provide some insights as to what I may be doing wrong?