ABSTRACT
An elastoplastic-viscoplastic model based on an original approach concerning the viscous modeling is presented. In this approach the viscous behavior is defined by internal viscous variables and a viscous yield surface. The model has been developed from the basic elastoplastic model (CJS model) and consider an additional viscous mechanism. The evolution of the viscous yield surface is governed by a particular hardening called “viscous hardening”. This model is able to explain the time-depending behavior of soils as creep (primary and secondary), stress relaxation, strain rate effect and loading-unloading effects. This model allows for the solving the classical viscoplasticity problem related to the plasticity failure and the rapid loading to be solved. The parameters of the model can be identified from the classical test results in laboratory.
