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A simple model for tertiary creep in geomaterials.

Osman, A. S. and Birchall, T. J. and Rouainia, M. (2020) 'A simple model for tertiary creep in geomaterials.', Geotechnical research., 70 (1). pp. 3-59.

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.

Item Type:Article
Full text:Publisher-imposed embargo
(AM) Accepted Manuscript
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Available under License - Creative Commons Attribution.
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Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
Download PDF
(964Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1680/jgere.19.00025
Publisher statement:Published with permission by the ICE under the CC-BY 4.0 license. (http://creativecommons.org/licenses/by/4.0/)
Date accepted:24 October 2019
Date deposited:28 October 2019
Date of first online publication:26 November 2019
Date first made open access:10 January 2020

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