Walker, C. orcid.org/0000-0002-4257-7794, Heitor, A. orcid.org/0000-0002-2346-8250 and Clarke, B. (2023) Shear Wave Velocity Response of Compacted Kaolin during Drying-Wetting Cycles. In: Bardanis, M., (ed.) E3S Web of Conferences. 8th International Conference on Unsaturated Soils (UNSAT 2023), 02-05 May 2023, Milos, Greece. EDP Sciences
Abstract
Previous studies indicate that that post-compacted changes in moisture and suction significantly influence small strain response, often this is not routinely monitored during operation. Thus, assessing the impacts of seasonal variation on performance is critical for gauging the geomechanical behaviour of compacted soils underlying typical transport infrastructure. In this paper the influence of drying-wettingcycles on small strain stiffness is investigated on compacted kaolin specimens by measuring shear velocity using ultrasonic testing methods. The drying-wetting cycles were applied to specimens using fixed levels of gravimetric water content. This more closely mimics near surface unsaturated site conditions rather thanadopting fixed suction levels using the axis translation technique. As expected, the results show that the shear wave velocity exhibits a hysteretic response during drying-wetting cycles. However, as the cycles are controlled by gravimetric water content, higher shear wave velocity values were recorded for the dryingpaths rather than wetting paths as previously reported in suction controlled testing. Furthermore, for the subsequent drying-wetting cycle, the shear wave velocity continues to show an hysteretic response while also exhibiting increasing velocities for a given gravimetric water content level, indicating that specimensare undergoing some form of hydraulic ageing.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | © The Authors, published by EDP Sciences, 2023. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Jul 2023 13:42 |
Last Modified: | 20 Jul 2023 13:42 |
Status: | Published |
Publisher: | EDP Sciences |
Identification Number: | 10.1051/e3sconf/202338206011 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:201697 |