Effect of rotational hardening rule on the behavior of clayey soils

Induced anisotropy is a constitutive feature of clays that can be numerically introduced through a proper "Rotational Hardening Rule" allowing the rotation of the yield and the potential plastic surfaces in the stress space. In this presentation, rotational hardening rule of yield surface for clays are first reviewed. Then, two typical rotational hardening rules are selected and compared through simulating drained triaxial tests of two Finnish clays. Furthermore, finite element simulations of a strip rigid footing considering different rotational hardening rules together with the case of isotropic yield surface without rotation are carried out in order to study the consequences of the isotropy assumption and the influence of the rotational hardening rule on the behavior of shallow foundation.