Load-controlled cyclic T-bar tests: A new method to assess effects of cyclic loading and consolidation
Load-controlled cyclic T-bar tests: A new method to assess effects of cyclic loading and consolidation
Full-flow T-bar and ball penetrometer tests are often used to measure intact and remoulded soil strengths, with the latter determined after several large-amplitude displacement cycles. In offshore design, the remoulded soil strength is often the governing design parameter during installation of subsea infrastructure, while a 'cyclic strength' applies for the less severe operational cyclic loading. This paper utilises T-bar penetrometer tests to measure both remoulded and cyclic strengths, where the latter is determined by way of a new test protocol involving cycles between load rather than displacement limits. The tests use kaolin clay and a reconstituted carbonate silt and involve three cyclic phases with intervening consolidation periods. The results demonstrate the important and beneficial role of consolidation, with the loss in strength due to remoulding sometimes surpassed by the strength recovery from consolidation. The most significant gains in strength, to 2·5 times the initial value, were measured in the load-controlled cyclic tests. These data demonstrate a novel way to characterise undrained cyclic strength, taking advantage of consolidation to reduce conservatism.
penetrometer, soil strength, cyclic loading, soil strength, consolidation andremoulding.
7-15
O'Loughlin, C.D.
b0fc277d-6301-45fd-a2a5-438655f822b0
Zhou, Z.
9679ce91-b86e-4355-901d-5a68abc50483
Stanier, S.A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
1 March 2020
O'Loughlin, C.D.
b0fc277d-6301-45fd-a2a5-438655f822b0
Zhou, Z.
9679ce91-b86e-4355-901d-5a68abc50483
Stanier, S.A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
O'Loughlin, C.D., Zhou, Z., Stanier, S.A. and White, D.J.
(2020)
Load-controlled cyclic T-bar tests: A new method to assess effects of cyclic loading and consolidation.
Géotechnique Letters, 10 (1), .
(doi:10.1680/jgele.19.00030).
Abstract
Full-flow T-bar and ball penetrometer tests are often used to measure intact and remoulded soil strengths, with the latter determined after several large-amplitude displacement cycles. In offshore design, the remoulded soil strength is often the governing design parameter during installation of subsea infrastructure, while a 'cyclic strength' applies for the less severe operational cyclic loading. This paper utilises T-bar penetrometer tests to measure both remoulded and cyclic strengths, where the latter is determined by way of a new test protocol involving cycles between load rather than displacement limits. The tests use kaolin clay and a reconstituted carbonate silt and involve three cyclic phases with intervening consolidation periods. The results demonstrate the important and beneficial role of consolidation, with the loss in strength due to remoulding sometimes surpassed by the strength recovery from consolidation. The most significant gains in strength, to 2·5 times the initial value, were measured in the load-controlled cyclic tests. These data demonstrate a novel way to characterise undrained cyclic strength, taking advantage of consolidation to reduce conservatism.
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Load-controlled cyclic T bar tests
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Accepted/In Press date: 10 June 2019
e-pub ahead of print date: 18 November 2019
Published date: 1 March 2020
Additional Information:
Funding Information:
This work was supported by the ARC Industrial Transformation Research Hub for Offshore Floating Facilities which is funded by the Australia Research Council, Woodside Energy, Shell, Bureau Veritas and Lloyds Register (grant IH140100012). The third author acknowledges the support of the Shell Chair in Offshore Engineering at University of Western Australia.
Publisher Copyright:
© 2020 ICE Publishing: all rights reserved.
Keywords:
penetrometer, soil strength, cyclic loading, soil strength, consolidation andremoulding.
Identifiers
Local EPrints ID: 439192
URI: http://eprints.soton.ac.uk/id/eprint/439192
PURE UUID: 24740ce3-8a61-425c-8873-add89184ced8
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Date deposited: 06 Apr 2020 16:36
Last modified: 17 Mar 2024 05:27
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Contributors
Author:
C.D. O'Loughlin
Author:
Z. Zhou
Author:
S.A. Stanier
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