Relationship for η_IS and micromechanical quantities (C_N and F_vM) at η_IS with ψ₀ for isotropic and K₀ consolidations (a) in the η_IS–ψ₀ space (triaxial tests), (b) η_IS–ψ₀ space (DEM), (c) in the C_IS–ψ₀ space (DEM) and (d) in the F_vM–ψ₀ space (DEM)