The University of Southampton
University of Southampton Institutional Repository

Microscale observation and modeling of soil-structure interface behavior using particle image velocimetry

Microscale observation and modeling of soil-structure interface behavior using particle image velocimetry
Microscale observation and modeling of soil-structure interface behavior using particle image velocimetry

The shearing behavior of a soil-structure interface governs the response of many geotechnical systems, in particular piled foundations. The shaft resistance of piled foundations is known to degrade with cyclic loading, although the governing mechanism is not well understood. This paper presents the results of a laboratory soil-structure investigation in which internal specimen deformations were obtained using particle image velocimetry (PIV) and the normal confining stress was permitted to vary according to a constant normal stiffness (CNS) condition. The PIV measurements showed the shear deformation and volume change to be concentrated within a shear band with a thickness of 5-7 particle diameters adjacent to the interface. During a single cycle the volume change within the shear band began with an initial contraction, followed by dilation to the failure envelop. For the cycling amplitude investigated this response led to a net specimen contraction. The benefit of quantifying the thickness and contraction of the shear band using PIV is that the progressive decrease in void ratio of the shear band can be linked to the limiting value imposed by the minimum void ratio. This provides a framework in which the contraction of the specimen depends on the potential contraction expressed as the difference between the current and minimum void ratio. A model for this contraction is presented, and linked to the decay in normal stress and the limiting loss of interface friction. This framework clarifies the mechanism of friction fatigue during installation and loading of displacement piles in sand.

CNS, Constant normal stiffness, Cyclic degradation, Cyclic shear, GeoPIV, Interface shear, Load transfer, Particle image velocimetry, PIV, Planar deformations (IGC: D7)
0038-0806
15-28
Dejong, Jason T.
f35a93e8-7b73-458c-8c4a-29fa59485437
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633
Dejong, Jason T.
f35a93e8-7b73-458c-8c4a-29fa59485437
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633

Dejong, Jason T., White, David J. and Randolph, Mark F. (2006) Microscale observation and modeling of soil-structure interface behavior using particle image velocimetry. Soils and Foundations, 46 (1), 15-28. (doi:10.3208/sandf.46.15).

Record type: Article

Abstract

The shearing behavior of a soil-structure interface governs the response of many geotechnical systems, in particular piled foundations. The shaft resistance of piled foundations is known to degrade with cyclic loading, although the governing mechanism is not well understood. This paper presents the results of a laboratory soil-structure investigation in which internal specimen deformations were obtained using particle image velocimetry (PIV) and the normal confining stress was permitted to vary according to a constant normal stiffness (CNS) condition. The PIV measurements showed the shear deformation and volume change to be concentrated within a shear band with a thickness of 5-7 particle diameters adjacent to the interface. During a single cycle the volume change within the shear band began with an initial contraction, followed by dilation to the failure envelop. For the cycling amplitude investigated this response led to a net specimen contraction. The benefit of quantifying the thickness and contraction of the shear band using PIV is that the progressive decrease in void ratio of the shear band can be linked to the limiting value imposed by the minimum void ratio. This provides a framework in which the contraction of the specimen depends on the potential contraction expressed as the difference between the current and minimum void ratio. A model for this contraction is presented, and linked to the decay in normal stress and the limiting loss of interface friction. This framework clarifies the mechanism of friction fatigue during installation and loading of displacement piles in sand.

This record has no associated files available for download.

More information

Published date: 2006
Keywords: CNS, Constant normal stiffness, Cyclic degradation, Cyclic shear, GeoPIV, Interface shear, Load transfer, Particle image velocimetry, PIV, Planar deformations (IGC: D7)

Identifiers

Local EPrints ID: 419849
URI: http://eprints.soton.ac.uk/id/eprint/419849
ISSN: 0038-0806
PURE UUID: cdb36738-0fc9-407f-bc05-c2fd9dfeebea
ORCID for David J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32

Export record

Altmetrics

Contributors

Author: Jason T. Dejong
Author: David J. White ORCID iD
Author: Mark F. Randolph

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×