info:eu-repo/semantics/article
Constitutive modeling and discontinuous bifurcation assessment in unsaturated soils
Fecha
2006-11Registro en:
Schiava, Roberto; Etse, Jose Guillermo; Constitutive modeling and discontinuous bifurcation assessment in unsaturated soils; American Society of Mechanical Engineers; Journal Of Applied Mechanics-transactions Of The Asme; 73; 6; 11-2006; 1039-1044
0021-8936
CONICET Digital
CONICET
Autor
Schiava, Roberto
Etse, Jose Guillermo
Resumen
In this work an elastoplastic constitutive theory for unsaturated soils is presented. The proposed material model is formulated in the general framework of the thory of porous media and of the flow theory of plasticity. The model is based on an extension of the well-known MRS Lade model whereby the suction and the effective stress tensor are introduced as additional independent and dependent stress components, respectively. Consequently the cap and cone yield conditions of the MRS Lade model both in hardening and softening as well as the internal evolution laws in these regimes are redefined to include the dependency on the suction. The paper illustrates the predictive capability of the extended MRS Lade model for partially saturated soils. Finally, the condition for discontinuous bifurcation in elastoplastic partially saturated porous media as well as the localized failure predictions of the proposed material formulation for diferent suctions and stress states are also analyzed and discussed.