Abstract: A soft clay constitutive model is developed based on the elastoplasticity theory and using modified CamClay model as the boundary surface. In the model, a shape factor is introduced to define the horizontal axis length of the ellipse yield surface, at the time a structural parameter is used to describe the structural damage strain. The parameters can be calibrated by conducting the laboratory one dimensional consolidation and triaxial rheological tests. This model was used to estimate the longterm settlement of a sea levee improved by surcharging method. The results indicate that the new constitutive model has the advantage of describe the behavior of the structural soft clays, compared with the conventional soft clay models.

Key words: Constitutive Model, Wenzhou Soft Clay, Structural Property, Rheological Property, Surcharge Preloading, Ground Surface Settlement Value