Strength and deformation characteristics of a locked sand
at low effective stresses
Strength and deformation characteristics of a locked sand
at low effective stresses
This paper describes the results of triaxial compression tests carried out at effective cell pressures ranging from 12.5 to 100 kPa to investigate the influence of fabric structure on the yield and failure of intact Reigate silver sand. In some of the tests, a digital image-based technique was used to determine the instant of onset of strain localisation, and the distribution of strain localisations within the specimen as overall deformation progressed. Comparative tests on intact and reconstituted specimens showed that fabric structure in the intact material allows the mobilisation of stress ratios close to peak before the onset of dilation, and increases the shear modulus at a given effective cell pressure and strain. Localisation was found to start at or after the onset of dilation, with a tendency to delay at increasing effective cell pressure. More localised deformation was observed at low effective cell pressures. Consistency between the critical state strengths of intact and reconstituted specimens is demonstrated, provided that the effect of shear band geometry is taken into account in stress analysis.
deformation, laboratory tests, fabric structure, natural sands, shear strength, small strains, stiffness, strain localisation, stress-dilatancy
543-556
Bhandari, A.R.
8024e53e-5172-424f-8e73-07de47165c62
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
October 2013
Bhandari, A.R.
8024e53e-5172-424f-8e73-07de47165c62
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Bhandari, A.R. and Powrie, W.
(2013)
Strength and deformation characteristics of a locked sand
at low effective stresses.
Granular Matter, 15 (5), .
(doi:10.1007/s10035-013-0426-8).
Abstract
This paper describes the results of triaxial compression tests carried out at effective cell pressures ranging from 12.5 to 100 kPa to investigate the influence of fabric structure on the yield and failure of intact Reigate silver sand. In some of the tests, a digital image-based technique was used to determine the instant of onset of strain localisation, and the distribution of strain localisations within the specimen as overall deformation progressed. Comparative tests on intact and reconstituted specimens showed that fabric structure in the intact material allows the mobilisation of stress ratios close to peak before the onset of dilation, and increases the shear modulus at a given effective cell pressure and strain. Localisation was found to start at or after the onset of dilation, with a tendency to delay at increasing effective cell pressure. More localised deformation was observed at low effective cell pressures. Consistency between the critical state strengths of intact and reconstituted specimens is demonstrated, provided that the effect of shear band geometry is taken into account in stress analysis.
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Published date: October 2013
Keywords:
deformation, laboratory tests, fabric structure, natural sands, shear strength, small strains, stiffness, strain localisation, stress-dilatancy
Organisations:
Infrastructure Group
Identifiers
Local EPrints ID: 358919
URI: http://eprints.soton.ac.uk/id/eprint/358919
ISSN: 1434-5021
PURE UUID: 5985a80d-24db-42c4-9eb0-f7db05e98776
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Date deposited: 15 Oct 2013 10:36
Last modified: 15 Mar 2024 02:48
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Author:
A.R. Bhandari
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