Generalized plasticity state parameter-based model for saturated and unsaturated soils. Part II: Unsaturated soil modeling

DIEGO MANZANAL; MANUEL PASTOR; JOSÉ ANTONIO FERNÁNDEZ MERODO

INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS

JOHN WILEY & SONS LTD

Lugar: Londres; Año: 2011 vol. 35 p. 1899 - 1917

0363-9061

The aim of this paper is to extend the generalized plasticity state parameter-based model presented in part 1 to reproduce the hydro-mechanical behavior of unsaturated soils. The proposed model is based on two pairs of stress?strain variables and a suitable hardening law taking into account the bonding?debonding effect of suction and degree of saturation. A generalized state parameter for unsaturated state is proposed to reproduce soil behavior using a single set of material parameters. Generalized plasticity gives a suitable framework to reproduce not only monotonic stress path but also cyclic behavior. The hydraulic hysteresis during a drying?wetting cycle and the void ratio effect on the hydraulic behavior is introduced. Comparison between model simulations and a series of experimental data available, both cohesive and granular, are given to illustrate the accuracy of the enhanced generalized plasticity equation.