A COMBINED HARDENING MODEL FOR ANISOTROPICALLY CONSOLIDATED CLAYS

抄録

A model introduced in the present paper is capable of describing the mechanical behaviour of anisotropically consolidated clay reasonably well. The salient features of the proposed model are summarized as follows : (i) Generalized forms of the Cambridge models are given to both yield function and plastic potential. (ii) A combination of isotropic and kinematic hardening is used. (iii) A non-associate flow rule is proposed. (iv) The isotropic hardening involves plastic work related to not only volumetric but also deviatoric deformation. (v) The translation of yield surface is specified by extending Ziegler's rule of kinematic hardening. (vi) The constitutive model is capable of describing expansion of yield surface with simultaneous translation in the stress space. Several undrained triaxial tests of anisotropically consolidated clay are simulated and the good agreement is observed between simulation and experimental data.