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Improved image-based deformation measurement in the centrifuge environment

Improved image-based deformation measurement in the centrifuge environment
Improved image-based deformation measurement in the centrifuge environment

This paper describes a new apparatus and techniques for performing deformation measurements using particle image velocimetry in the centrifuge environment. The new system includes camera, lighting, and control equipment that facilitates image capture at least 30 times faster than that in legacy systems. Methods for optimizing the addition of artificial seeding on the exposed plane of a geotechnical model are also set out. These techniques ensure that the precision of the deformation calculations is optimized even in models with multiple layers of different soils, fully harnessing the method's capabilities. An example application of a flat footing penetrating sand overlying clay is used to illustrate the performance of the equipment and the artificial seeding optimization technique. Deformation fields at the point of peak resistance during punchthrough are presented in the form of vector fields, normalized displacement contours, and shear strain contours. It is shown that the advances in equipment and artificial seeding allow both macroscopic and grain-scale deformation features to be identified. These analyses highlight not only the benefits of the new technology, but also the need for carefully optimized experimental procedures to maximize the measurement precision.

Centrifuge, Deformation measurement, Optimization, Particle image velocimetry, PIV, Precision, Texture
0149-6115
915-928
Stanier, S.A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Stanier, S.A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93

Stanier, S.A. and White, D.J. (2013) Improved image-based deformation measurement in the centrifuge environment. Geotechnical Testing Journal, 36 (6), 915-928. (doi:10.1520/GTJ20130044).

Record type: Article

Abstract

This paper describes a new apparatus and techniques for performing deformation measurements using particle image velocimetry in the centrifuge environment. The new system includes camera, lighting, and control equipment that facilitates image capture at least 30 times faster than that in legacy systems. Methods for optimizing the addition of artificial seeding on the exposed plane of a geotechnical model are also set out. These techniques ensure that the precision of the deformation calculations is optimized even in models with multiple layers of different soils, fully harnessing the method's capabilities. An example application of a flat footing penetrating sand overlying clay is used to illustrate the performance of the equipment and the artificial seeding optimization technique. Deformation fields at the point of peak resistance during punchthrough are presented in the form of vector fields, normalized displacement contours, and shear strain contours. It is shown that the advances in equipment and artificial seeding allow both macroscopic and grain-scale deformation features to be identified. These analyses highlight not only the benefits of the new technology, but also the need for carefully optimized experimental procedures to maximize the measurement precision.

Full text not available from this repository.

More information

Accepted/In Press date: 29 July 2013
Published date: November 2013
Keywords: Centrifuge, Deformation measurement, Optimization, Particle image velocimetry, PIV, Precision, Texture

Identifiers

Local EPrints ID: 419748
URI: https://eprints.soton.ac.uk/id/eprint/419748
ISSN: 0149-6115
PURE UUID: 6d4ab889-fafb-407e-80b7-266eb7822795
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 20 Apr 2018 16:30
Last modified: 23 Sep 2019 17:02

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