Experimental and numerical investigation of diffuse instability in granular materials using a microstructural model under various loading paths

A. Daouadji, P. Y. Hicher, M. Jrad, B. Sukumaran, S. Belouettar

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Depending on stress state and loading conditions, instability in loose sand can develop at a shear stress level much lower than the Mohr-Coulomb failure criterion. This type of failure mode, very different from strain-softening in dense sand, can lead to catastrophic collapse of earth structures. An appropriate constitutive model is therefore needed that can capture the correct failure modes and accurately predict the stress-strain response for both dense and loose sands. In this paper, a micromechanical approach developed earlier for the modelling of granular material behaviour is adopted. The constitutive model is utilised to simulate undrained triaxial, constant-q and proportional strain tests on loose sand, and numerical results are compared with experimental results. The model is capable of accurately reproducing the macroscopic experimental tests, and is also able to provide microstructural information. This enables the observation of instability at the particle scale, and provides a better understanding of the linkage between particle-scale instability and instability at the assembly level.

Original languageEnglish (US)
Pages (from-to)368-381
Number of pages14
JournalGeotechnique
Volume63
Issue number5
DOIs
StatePublished - Apr 1 2013

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Granular materials
Sand
sand
Constitutive models
Failure modes
Earth structure
softening
shear stress
Shear stress
Earth (planet)
material
modeling
test
particle

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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abstract = "Depending on stress state and loading conditions, instability in loose sand can develop at a shear stress level much lower than the Mohr-Coulomb failure criterion. This type of failure mode, very different from strain-softening in dense sand, can lead to catastrophic collapse of earth structures. An appropriate constitutive model is therefore needed that can capture the correct failure modes and accurately predict the stress-strain response for both dense and loose sands. In this paper, a micromechanical approach developed earlier for the modelling of granular material behaviour is adopted. The constitutive model is utilised to simulate undrained triaxial, constant-q and proportional strain tests on loose sand, and numerical results are compared with experimental results. The model is capable of accurately reproducing the macroscopic experimental tests, and is also able to provide microstructural information. This enables the observation of instability at the particle scale, and provides a better understanding of the linkage between particle-scale instability and instability at the assembly level.",
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Experimental and numerical investigation of diffuse instability in granular materials using a microstructural model under various loading paths. / Daouadji, A.; Hicher, P. Y.; Jrad, M.; Sukumaran, B.; Belouettar, S.

In: Geotechnique, Vol. 63, No. 5, 01.04.2013, p. 368-381.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Experimental and numerical investigation of diffuse instability in granular materials using a microstructural model under various loading paths

AU - Daouadji, A.

AU - Hicher, P. Y.

AU - Jrad, M.

AU - Sukumaran, B.

AU - Belouettar, S.

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AB - Depending on stress state and loading conditions, instability in loose sand can develop at a shear stress level much lower than the Mohr-Coulomb failure criterion. This type of failure mode, very different from strain-softening in dense sand, can lead to catastrophic collapse of earth structures. An appropriate constitutive model is therefore needed that can capture the correct failure modes and accurately predict the stress-strain response for both dense and loose sands. In this paper, a micromechanical approach developed earlier for the modelling of granular material behaviour is adopted. The constitutive model is utilised to simulate undrained triaxial, constant-q and proportional strain tests on loose sand, and numerical results are compared with experimental results. The model is capable of accurately reproducing the macroscopic experimental tests, and is also able to provide microstructural information. This enables the observation of instability at the particle scale, and provides a better understanding of the linkage between particle-scale instability and instability at the assembly level.

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