A SUCTION INDUCED MODIFICATION IN ELASTOPLASTIC BEHAVIOUR OF PARTIALLY SATURATED SOILS

J.L. MROGINSKI; H.A. DI RADO; P.A. BENEYTO; A.M. AWRUCH

Santa Fe - Argentina

Congreso; XV Congreso sobre Métodos Numéricos y sus Aplicaciones (ENIEF 2006); 2006

AMCA

The main goal of the present paper is to carry out a plastic mathematical model for partially saturated soils based on the Critical State Theory (J.H. Atkinson and P.L. Bransby, McGraw Hill, (1978)). For this scope, a plastic yield criterion for saturated soil (H.A. Di Rado, et.al. Informacion Tecnologica,10(6):165-175(1999)), was re formulated for partially saturated soils by the inclusion of the matric suction as an independent parameter. Another two adjustment parameters were included and a kinematic and an isotropic expansion of the yield function were combined. The computational implementation was carried out using the Finite Elements Method. Diverse results were presented and some discussions about the pore pressures and the vertical displacements were addressed showing the adaptability of the model to highly compressive non saturated soils.