Influence of Installation Method on the Axial Capacity of Piles in Very Dense Sand
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 150, Issue 6
Abstract
Three driven precast, four driven cast-in-situ, and four screw injection piles were installed and tested in dense to very dense sand at a site in the Netherlands. Each pile was instrumented with two types of fiber optic sensors and tested under axial compression. Through these tests, a comparison could be made of how different installation methods influence the pile base and shaft response. For example, large residual base stresses were measured in the driven precast piles after installation. Of the three pile types tested, the driven precast piles also reached the highest base stresses, mobilizing their full base resistance at comparatively low displacements. The base response of the driven cast-in-situ piles was also like that of a driven precast pile with residual stresses excluded. In contrast, the screw injection piles mobilized much lower ultimate base resistances and with a much lower stiffness. In terms of shaft resistance, the precast piles showed friction fatigue effects in line with existing models, but this effect was not evident for the driven cast-in-situ or screw injection piles. Finally, shaft and base resistances measured in the dense to very dense sand layers were greater than limiting resistances prescribed in several design standards. By taking this into consideration in design standards, the results would help reduce some of the overconservatism present in design and consequently reduce the financial and environmental cost of pile manufacturing and installation.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research is part of the InPAD project, a project funded through Het Topconsortium voor Kennis en Innovatie (TKI) Deltatechnologie and seven industry partners: Delft University of Technology, Deltares, Dutch Association of Piling Contractors (NVAF), Dutch Ministry of Infrastructure and Water Management, Fugro, Port of Rotterdam Authority, and the Municipality of Rotterdam. In addition, the authors would like to acknowledge the Port of Rotterdam Authority for their financial support of the Amaliahaven pile tests, Buildwise (formerly WTCB) for the instrumentation and monitoring of the test piles, and both Mariteam and De Klerk for assisting with the planning and execution of the pile tests. The feedback of the reviewers is also greatly appreciated.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 150 • Issue 6 • June 2024
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© 2024 American Society of Civil Engineers.
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Received: Jun 16, 2023
Accepted: Dec 26, 2023
Published online: Apr 8, 2024
Published in print: Jun 1, 2024
Discussion open until: Sep 8, 2024
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- Kevin Duffy, Ken Gavin, Mandy Korff, Dirk de Lange, Base Resistance of Screw Displacement Piles in Sand, Journal of Geotechnical and Geoenvironmental Engineering, 10.1061/JGGEFK.GTENG-12340, 150, 8, (2024).