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Published in:
2005 | OriginalPaper | Chapter
A unified framework for elastoplasticity of unsaturated soils: From capillary hysteresis to soil skeletal deformations
Authors : Kanthasamy K. Muraleetharan, Changfu Wei
Published in: Unsaturated Soils: Numerical and Theoretical Approaches
Publisher: Springer Berlin Heidelberg
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A theoretical framework for modeling the elastoplastic constitutive behavior of unsaturated soils is presented. By combining the theory of mixtures with interfaces (TMI) and continuum theory of plasticity, a dissipation mechanism associated with capillary hysteresis is identified. We show that the plastic deformation of the soil matrix can be described by using a pseudo effective stress tensor. In this context the plastic deformation and capillary hysteresis are consistently simulated in a hierarchical and coupled manner. The proposed framework preserves all the advantages of those models based on the effective stress concept, two stress state variables, and mixture theory, while excluding their drawbacks.