Friction fatigue on displacement piles in sand
Friction fatigue on displacement piles in sand
Experiments with instrumented displacement piles have shown that the ultimate shaft friction that can develop in a given sand horizon decreases as the pile tip penetrates to deeper levels. This phenomenon, which is now commonly referred to as friction fatigue, is investigated here using centrifuge model piles equipped with lateral stress sensors, and by drawing on other experimental data from the laboratory and the field. It is shown that the primary mechanism controlling friction fatigue is the cyclic history imparted during pile installation to soil elements at the pile-sand interface. For a given installation method the stationary lateral stress acting at any given level on a displacement pile can be described as a relatively unique function of the cone penetration test end resistance and the number of cycles imposed during installation. The strong influence of cycling, which is also seen in cyclic constant normal stiffness interface shear tests, is attributed to contraction of a narrow shear zone at the shaftsoil interface that is surrounded by soil with a relatively high lateral stiffness.
Piles, Sands
645-658
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Lehane, B.M.
2cd47dd0-78e4-4e40-809b-7ea6804a3a8a
December 2004
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Lehane, B.M.
2cd47dd0-78e4-4e40-809b-7ea6804a3a8a
Abstract
Experiments with instrumented displacement piles have shown that the ultimate shaft friction that can develop in a given sand horizon decreases as the pile tip penetrates to deeper levels. This phenomenon, which is now commonly referred to as friction fatigue, is investigated here using centrifuge model piles equipped with lateral stress sensors, and by drawing on other experimental data from the laboratory and the field. It is shown that the primary mechanism controlling friction fatigue is the cyclic history imparted during pile installation to soil elements at the pile-sand interface. For a given installation method the stationary lateral stress acting at any given level on a displacement pile can be described as a relatively unique function of the cone penetration test end resistance and the number of cycles imposed during installation. The strong influence of cycling, which is also seen in cyclic constant normal stiffness interface shear tests, is attributed to contraction of a narrow shear zone at the shaftsoil interface that is surrounded by soil with a relatively high lateral stiffness.
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Published date: December 2004
Keywords:
Piles, Sands
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Local EPrints ID: 419848
URI: http://eprints.soton.ac.uk/id/eprint/419848
ISSN: 0016-8505
PURE UUID: 0d59d841-385a-46bc-88be-f43936c7c367
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Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32
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Author:
B.M. Lehane
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