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A simple model for tertiary creep in geomaterials

Lookup NU author(s): Professor Mohamed Rouainia

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Abstract

This paper presents a constitutive modelling approach for 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, is that it requires only a few parameters that can be derived from conventional laboratory testing. The model has been specifically 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 shows that the model is remarkably successful in capturing the stress–strain response both at peak stress and in the region of material softening and the time to reach failure.

Publication metadata

Author(s): Osman AS, Birchall TJ, Rouainia M

Publication type: Article

Publication status: Published

Journal: Geotechnical Research

Year: 2020

Volume: 7

Issue: 1

Pages: 26-39

Print publication date: 20/03/2020

Online publication date: 26/11/2019

Acceptance date: 24/10/2019

Date deposited: 03/01/2020

ISSN (electronic): 2052-6156

Publisher: ICE Publishing

URL: https://doi.org/10.1680/jgere.19.00025

DOI: 10.1680/jgere.19.00025

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