Journal
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume 46, Issue 10, Pages 1895-1918Publisher
WILEY
DOI: 10.1002/nag.3373
Keywords
large deformation; shear band; soil plasticity; three-invariant cap model; viscoplasticity
Funding
- U.S. Strategic Environmental Research and Development Program (SERDP) [W912HQ18C0099]
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A three-invariant continuum cap plasticity model with viscoplastic features is developed for modeling the large deformation of soil, capturing multiple failure mechanisms.
A three-invariant continuum cap plasticity model with viscoplastic features is developed for modeling the large deformation of soil. Multiple failure mechanisms including combined shear and compaction yielding and loss of strength under tension can be captured by this model. The shear yield surface of the model is formulated to be nonlinear and pressure-dependent. The model also features a cap surface that governs inelastic compaction hardening. This cap is formulated as an explicit expression of porosity. The differences in triaxial compression and extension strength are also considered. A set of numerical examples are carried out, including triaxial compression and compression-shear tests, in order to examine the model under confined loading conditions, and observe the formation of shear bands.
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