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Flat boundaries and their effect on sand testing

Flat boundaries and their effect on sand testing
Flat boundaries and their effect on sand testing
A study of the effect of the use of flat boundaries on the stressing of a sample of an idealized granular material with no applied shear is presented. Discrete element method (DEM) data of 1D compression were analysed and the local strain field inside the sample was investigated as the sample was stressed. A best-fit strain was seen to best describe the material behaviour free from boundary effects. The individual particle displacements were probed, providing insight into the behaviour of particles adjacent to the boundaries. In addition, the porosity and force distribution inside the sample were observed, allowing for estimates of the width of a boundary region to be made. This region, non-representative of far-field material behaviour, will affect the behaviour of a granular sample in DEM or laboratory tests, with local porosity differences leading to a change in the transport properties of the sample, and force distribution changes leading to a bias in the location of grain cracking or crushing events for sufficiently high stress levels. Nevertheless, the largest effect of the boundary region was a severe underestimation of the stiffness of a granular material.
1096-9853
821- 837
Marketos, G.
0a6a8e9f-94aa-4115-a7be-30522fbb1831
Bolton, Malcolm D.
9fbf6ba8-1095-4220-a7f6-38f5463a58e7
Marketos, G.
0a6a8e9f-94aa-4115-a7be-30522fbb1831
Bolton, Malcolm D.
9fbf6ba8-1095-4220-a7f6-38f5463a58e7

Marketos, G. and Bolton, Malcolm D. (2010) Flat boundaries and their effect on sand testing. International Journal for Numerical and Analytical Methods in Geomechanics, 34 (8), 821- 837. (doi:10.1002/nag.835).

Record type: Article

Abstract

A study of the effect of the use of flat boundaries on the stressing of a sample of an idealized granular material with no applied shear is presented. Discrete element method (DEM) data of 1D compression were analysed and the local strain field inside the sample was investigated as the sample was stressed. A best-fit strain was seen to best describe the material behaviour free from boundary effects. The individual particle displacements were probed, providing insight into the behaviour of particles adjacent to the boundaries. In addition, the porosity and force distribution inside the sample were observed, allowing for estimates of the width of a boundary region to be made. This region, non-representative of far-field material behaviour, will affect the behaviour of a granular sample in DEM or laboratory tests, with local porosity differences leading to a change in the transport properties of the sample, and force distribution changes leading to a bias in the location of grain cracking or crushing events for sufficiently high stress levels. Nevertheless, the largest effect of the boundary region was a severe underestimation of the stiffness of a granular material.

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Published date: 10 June 2010
Organisations: National Oceanography Centre

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Local EPrints ID: 72537
URI: http://eprints.soton.ac.uk/id/eprint/72537
ISSN: 1096-9853
PURE UUID: e21d5a8a-e378-4201-bfcb-ae1c74d3ab22

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Date deposited: 16 Feb 2010
Last modified: 13 Mar 2024 21:33

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Contributors

Author: G. Marketos
Author: Malcolm D. Bolton

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