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Elastoviscoplastic modelling with distorted isotaches and swelling for constant strain rate and incremental loading

Vergote, TA
Leung, CFChian, SC
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Abstract
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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Source Title
International Journal for Numerical and Analytical Methods in Geomechanics
Publisher
Wiley
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Date
2021-09-01
DOI
10.1002/nag.3248
Type
Article
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