A simple model for tertiary creep in geomaterials

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

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
• Electronic ISSN: 2052-6156
• Publisher: ICE Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 70
• Issue: 1
• Pages: 3-59
• DOI: https://doi.org/10.1680/jgere.19.00025
• Public URL: https://durham-repository.worktribe.com/output/1286755