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Micro mechanics of drained and undrained shearing of compacted and overconsolidated crushable sand

de Bono, J. P.; McDowell, Glenn R.

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Abstract

A numerical crushable soil sample has been created using the previously published McDowell and de Bono (2013) model and subjected to a range of stress paths. Compacted sand simulations are performed using conventional triaxial stress paths, constant mean stress and constant volume conditions and a critical state line established. Overconsolidated samples have been created by crushing the soil down the isotropic normal compression line, unloading, and shearing at constant radial stress, constant mean stress or constant volume and a critical state line is again established. The critical state line is unique at high stresses for the simulated compacted and overconsolidated sands and is parallel to the isotropic normal compression line, in agreement with available data and a previously published theory. The critical state line at low stress levels is non-unique and a function of the particle size distribution, in agreement with available data. Constant volume tests exhibit the well-known phenomena of phase transformation points and peak strengths are observed for ‘drained’ soils on the dense side of critical. The numerical soil produces a state boundary surface that compares well to available data.

Citation

de Bono, J. P., & McDowell, G. R. (2018). Micro mechanics of drained and undrained shearing of compacted and overconsolidated crushable sand. Géotechnique, 68(7), 575-589. https://doi.org/10.1680/jgeot.16.P.318

Journal Article Type Article
Acceptance Date Sep 15, 2017
Online Publication Date Oct 26, 2017
Publication Date Jul 1, 2018
Deposit Date Oct 2, 2017
Publicly Available Date Oct 26, 2017
Journal Géotechnique
Print ISSN 0016-8505
Electronic ISSN 1751-7656
Publisher Thomas Telford
Peer Reviewed Peer Reviewed
Volume 68
Issue 7
Pages 575-589
DOI https://doi.org/10.1680/jgeot.16.P.318
Keywords compressibility; discrete-element modelling; fractals; particle crushing/crushability; particle-scale behaviour
Public URL http://eprints.nottingham.ac.uk/id/eprint/46897
Publisher URL http://www.icevirtuallibrary.com/doi/10.1680/jgeot.16.P.318
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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