A simple model for tertiary creep in geomaterials

Osman, A.S.; Birchall, T.J.; Rouainia, M.

doi:10.1680/jgere.19.00025

A simple model for tertiary creep in geomaterials

Osman, A.S.; Birchall, T.J.; Rouainia, M.

Authors

Professor Ashraf Osman ashraf.osman@durham.ac.uk
Professor

T.J. Birchall

M. Rouainia

Abstract

This paper presents a constitutive modelling approach to the viscoplastic-damage behaviour of geomaterials. This approach is based on the hyperelasticity framework where the entire constitutive behaviour is derived from only two scalar potentials: a free energy potential and a dissipation function. The novelty of the new proposed model, in addition to being thermodynamically consistent, it requires only a few parameters which can be derived from conventional laboratory testing. The model has been specically tested for its ability to reproduce a series of triaxial compression tests on core rock samples. The comparison between the viscoplastic-damage model predictions and experimental results show the model is remarkably successful in capturing the stress-strain response at both peak stress and in the region of material softening and the time to reach failure.

Citation

Osman, A., Birchall, T., & Rouainia, M. (2020). A simple model for tertiary creep in geomaterials. Geotechnical Research, 70(1), 3-59. https://doi.org/10.1680/jgere.19.00025

Journal Article Type	Article
Acceptance Date	Oct 24, 2019
Online Publication Date	Nov 26, 2019
Publication Date	Jan 1, 2020
Deposit Date	Oct 28, 2019
Publicly Available Date	Jan 10, 2020
Journal	Geotechnical Research
Publisher	ICE Publishing
Peer Reviewed	Peer Reviewed
Volume	70
Issue	1
Pages	3-59
DOI	https://doi.org/10.1680/jgere.19.00025

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Advance online version Published with permission by the ICE under the
CC-BY 4.0 license.
(http://creativecommons.org/licenses/by/4.0/)