Changing soil response during episodic cyclic loading in direct simple shear tests
Changing soil response during episodic cyclic loading in direct simple shear tests
Undrained cyclic loading of normally consolidated clays, interspersed with consolidation (i.e., episodic cyclic loading), hasbeen shown to lead to softening followed by hardening, manifested by evolving parameters such as strength, stiffness, andcoefficient of consolidation. The current evidence base is drawn from tests in which soil strength has been fully mobilized ineach cycle of loading, whereas in practice, changes in stress around a geotechnical infrastructure typically occur only at aprefailure level. This paper presents results from a set of stress-controlled episodic cyclic direct simple shear tests imposingprefailure stress reversals in each cycle. Differences in soil response are identified for the same total number of cycles ofloading but imposed through packets of different numbers of cycles and, consequently, different numbers of interveningconsolidation stages. The results highlight the effect of load history on operational soil properties and quantify the effect ofthe undrained prefailure cyclic loading history on the evolution of the soil properties, supporting the application of wholelife geotechnical design in practice.
Offshore engineering, clay, direct simple shear, geotechnics
54-61
Laham, Noor
d4af2376-9e9c-4b89-aa76-972f2b78fb0e
Kwa, Katherine
18faee0d-75d9-4683-a2c8-604625eecbb0
Deeks, Andrew
79ea4e10-e619-4531-9009-fe0eec4705c9
Suzuki, Yusuke
e7f0950d-ec9e-4756-81ec-179d2e8119d9
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
1 March 2023
Laham, Noor
d4af2376-9e9c-4b89-aa76-972f2b78fb0e
Kwa, Katherine
18faee0d-75d9-4683-a2c8-604625eecbb0
Deeks, Andrew
79ea4e10-e619-4531-9009-fe0eec4705c9
Suzuki, Yusuke
e7f0950d-ec9e-4756-81ec-179d2e8119d9
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Laham, Noor, Kwa, Katherine, Deeks, Andrew, Suzuki, Yusuke, White, David and Gourvenec, Susan
(2023)
Changing soil response during episodic cyclic loading in direct simple shear tests.
International Journal of Offshore and Polar Engineering, 33 (1), .
(doi:10.17736/ijope.2023.cl22).
Abstract
Undrained cyclic loading of normally consolidated clays, interspersed with consolidation (i.e., episodic cyclic loading), hasbeen shown to lead to softening followed by hardening, manifested by evolving parameters such as strength, stiffness, andcoefficient of consolidation. The current evidence base is drawn from tests in which soil strength has been fully mobilized ineach cycle of loading, whereas in practice, changes in stress around a geotechnical infrastructure typically occur only at aprefailure level. This paper presents results from a set of stress-controlled episodic cyclic direct simple shear tests imposingprefailure stress reversals in each cycle. Differences in soil response are identified for the same total number of cycles ofloading but imposed through packets of different numbers of cycles and, consequently, different numbers of interveningconsolidation stages. The results highlight the effect of load history on operational soil properties and quantify the effect ofthe undrained prefailure cyclic loading history on the evolution of the soil properties, supporting the application of wholelife geotechnical design in practice.
Text
CL_22_Laham_sm_cc_Final_Reviewed
- Accepted Manuscript
More information
Accepted/In Press date: 1 November 2022
Published date: 1 March 2023
Additional Information:
Funding Information:
This study forms part of the activities of the Royal Academy of Engineering Chair in Emerging Technologies Centre of Excellence for Intelligent & Resilient Ocean Engineering (IROE) at the University of Southampton through the collaboration project “Characterization of Geotechnical Properties for Whole Life Design” with the Norwegian Geotechnical Institute (NGI). Financial support from the Norwegian Research Council under its basic funding program for NGI is acknowledged. This project was also supported by the Royal Academy of Engineering under the Research Fellowship programme, which also supports Katherine Kwa. Susan Gourvenec is supported by the Royal Academy of Engineering under the Chairs in Emerging Technologies scheme. David White is supported by the Engineering and Physical Sciences Research Council (EPSRC) Offshore Renewable Energy Supergen Hub (EPSRC Grant No. EP/S000747/1).
Keywords:
Offshore engineering, clay, direct simple shear, geotechnics
Identifiers
Local EPrints ID: 476800
URI: http://eprints.soton.ac.uk/id/eprint/476800
ISSN: 1053-5381
PURE UUID: 253d35e0-dd39-408e-b978-0d16991dda37
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Date deposited: 16 May 2023 16:50
Last modified: 17 Mar 2024 03:57
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Author:
Andrew Deeks
Author:
Yusuke Suzuki
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