Journal
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume 45, Issue 13, Pages 1920-1933Publisher
WILEY
DOI: 10.1002/nag.3248
Keywords
consolidation; creep; swelling; viscoplasticity
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The novel elastoviscoplastic model improves the modeling of one-dimensional unloading response of soils, featuring a flexible reference isotache and full hydro-mechanical coupling. Calibration of the model was conducted with laboratory tests involving complex stress paths.
A novel elastoviscoplastic model is proposed to improve the modelling of the one-dimensional unloading response of soils. Creep is modelled as an isotache process, but with the possibility to incorporate distortion of the isotaches after unloading. Upon unloading, swelling develops as a transient superimposed process that enables the sequential occurrence of swelling and creep as observed in experiments. The model features a flexible reference isotache to improve the fit to real laboratory tests. The model is implemented with full hydro-mechanical coupling and enables simulation of both load-controlled and strain rate-controlled stress paths. The model is calibrated with a laboratory test with a complex stress path including constant rate of strain, incremental loading and relaxation stages.
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