Concept design of a new CPT module for direct in situ measurement of p-y soil responses
Concept design of a new CPT module for direct in situ measurement of p-y soil responses
Due to the rapid expansion of the offshore energy market, driven by the installation of wind turbines founded on single-or multi-piled foundations, the design and optimisation of laterally loaded piles has attracted enormous interest in the last decade. Current industrial design practice, for offshore and onshore piles, typically employs lateral load-displacement springs (p-y) to model the soil response under serviceability, ultimate or fatigue limit state scenarios of this foundation type, supplemented by moment and axial springs. Correlations based on CPT data are commonly used to determine soil properties and, in turn, the stiffness and resistance of the p-y reaction curves, in advance of detailed laboratory testing that follows later in the project schedule. To extend the potential for in situ testing to support lateral pile design, this paper presents the novel idea of complementing a CPT device with a new module capable of probing the soil in such manner that the monotonic and cyclic p-y soil response (including its evolution during the foundation design life) can be directly measured in the field. The stress and strain fields induced by such a module resemble those of a miniature laterally loaded pile element and differ from circular or flat cavity expansions induced by pressuremeters or dilat-ometers. The new device will be developed in a collaborative research project ‘ROBOCONE’ financed by the UK and Irish research councils. The background thinking and initial conceptual design of the device, including the review and selection of appropriate motion mechanisms and instrumentation, is presented in this manuscript.
900-906
Diambra, A.
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Creasey, J.
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Leonet, J.
3751022c-db96-4dfd-808b-5dcbad225669
Conn, A.
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Ibraim, E.
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Mylonakis, G.
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White, D. J.
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Cerfontaine, B.
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Gourvenec, S. M.
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Igoe, D.
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2022
Diambra, A.
22d20b7d-0975-4af8-beb3-8ee0a6e4fbc6
Creasey, J.
8f5860d5-a529-436a-add2-9cdecfd73958
Leonet, J.
3751022c-db96-4dfd-808b-5dcbad225669
Conn, A.
4cf1d5ce-a269-4fe9-9a41-044ddb150140
Ibraim, E.
158a2c95-7527-4620-862e-c9cee274b22a
Mylonakis, G.
8aa37314-d7c9-4962-bcc3-9a0ce1c4537b
White, D. J.
a986033d-d26d-4419-a3f3-20dc54efce93
Cerfontaine, B.
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Gourvenec, S. M.
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Igoe, D.
455830c4-ce8e-4760-9839-b11fda452b83
Diambra, A., Creasey, J., Leonet, J., Conn, A., Ibraim, E., Mylonakis, G., White, D. J., Cerfontaine, B., Gourvenec, S. M. and Igoe, D.
(2022)
Concept design of a new CPT module for direct in situ measurement of p-y soil responses.
Gottardi, Guido and Tonni, Laura
(eds.)
In Cone Penetration Testing 2022 - Proceedings of the 5th International Symposium on Cone Penetration Testing, CPT 2022.
CRC Press / Balkema.
.
(doi:10.1201/9781003308829-134).
Record type:
Conference or Workshop Item
(Paper)
Abstract
Due to the rapid expansion of the offshore energy market, driven by the installation of wind turbines founded on single-or multi-piled foundations, the design and optimisation of laterally loaded piles has attracted enormous interest in the last decade. Current industrial design practice, for offshore and onshore piles, typically employs lateral load-displacement springs (p-y) to model the soil response under serviceability, ultimate or fatigue limit state scenarios of this foundation type, supplemented by moment and axial springs. Correlations based on CPT data are commonly used to determine soil properties and, in turn, the stiffness and resistance of the p-y reaction curves, in advance of detailed laboratory testing that follows later in the project schedule. To extend the potential for in situ testing to support lateral pile design, this paper presents the novel idea of complementing a CPT device with a new module capable of probing the soil in such manner that the monotonic and cyclic p-y soil response (including its evolution during the foundation design life) can be directly measured in the field. The stress and strain fields induced by such a module resemble those of a miniature laterally loaded pile element and differ from circular or flat cavity expansions induced by pressuremeters or dilat-ometers. The new device will be developed in a collaborative research project ‘ROBOCONE’ financed by the UK and Irish research councils. The background thinking and initial conceptual design of the device, including the review and selection of appropriate motion mechanisms and instrumentation, is presented in this manuscript.
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More information
Published date: 2022
Additional Information:
Funding Information:
This paper presents the initial feasibility study and background thinking for the future development of a new additional ‘p-y’ modular section which can complement the standard CPT equipment. The work is part of a new collaborative research project involving the University of Bristol, University of Southampton and Trinity College Dublin, financially supported by the UK-Ireland research councils.
Funding Information:
The authors would like to acknowledge the financial support from the Engineering and Physical Sciences Research Council (EPSRC - Ref: EP/W006235/1) and Science Foundation Ireland (SFI - Ref: 21/ EPSRC/3787).
Publisher Copyright:
© 2022 the Author(s).
Venue - Dates:
5th International Symposium on Cone Penetration Testing, CPT 2022, , Bologna, Italy, 2022-06-08 - 2022-06-10
Identifiers
Local EPrints ID: 477482
URI: http://eprints.soton.ac.uk/id/eprint/477482
PURE UUID: 1d83e8e9-172b-4150-bd23-40ed09fec26c
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Date deposited: 06 Jun 2023 17:18
Last modified: 18 Mar 2024 03:57
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Contributors
Author:
A. Diambra
Author:
J. Creasey
Author:
J. Leonet
Author:
A. Conn
Author:
E. Ibraim
Author:
G. Mylonakis
Author:
D. Igoe
Editor:
Guido Gottardi
Editor:
Laura Tonni
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