disp 0[cm] "Axial displacement" Nu 0.2 "Poisson's ratio" Rho 2400[kg/m^3] Density E50ref 20[MPa] "Reference stiffness for primary loading" Eurref 60[MPa] "Reference stiffness for unloading and reloading" e0 0.89 "Initial void ratio" m 0.65 "Stress exponent" rc 1.75 "Swelling to compression ratio" c 1[kPa] Cohesion Psi 1.5[deg] "Dilatation angle" Phi 34[deg] "Angle of internal friction" Rc 1.0428 "Ellipse aspect ratio" p0 300[kPa] Pressure