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)
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
2006
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), .
(doi:10.3208/sandf.46.15).
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.
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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
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Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32
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Author:
Jason T. Dejong
Author:
Mark F. Randolph
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