Impact of the shape of the yield surface on the behavior of clayey soils

Abstract eng:
The scope of this contribution is a response of fine grained clayey soils under mechanical load. A generalized formulation of modified Cam clay material model is introduced. This formulation deals with unrealistic softening behaviour that predicts the modified Cam clay formulation by reducing the yield surface in the dilatation domain. Further the generalized formulation adopts a dependency of the yield surface to the Lode angle and cohesion similarly to Mohr-Coulomb model. The formulation of the model requires six material parameters such as compression and swelling moduli, friction angel, cohesion and initial porosity which can be easily obtained from standard tests. Finally a number of numerical results demonstrate the behaviour of this critical state model and the influence of the yield surface. ´

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