Practical Analytical Approach for Estimating Long-Term and Set-Up Shaft Resistance of Prebored Piles
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 146, Issue 10
Abstract
This paper presents a practical analytical approach to evaluating the long-term and set-up shaft resistance of prebored piles. The key contributions of this study lie in the fact that not only all aspects involved, from pile installation to pile loading, but also the residual stress propagated from the vertically shearing effect during pile installation are properly considered in the proposed analytical approach. The installation effects of a prebored pile are simulated as undrained expansion of a cylindrical cavity followed by vertically shearing the soils along the boundary of the pile shaft. To develop the possible analytical approximation technique, simplified solutions for the stress and excess pore pressure changes in critical sate soils due to cavity expansion are adopted in the formulations, while a modified Terzaghi’s consolidation theory that incorporates a variable coefficient of consolidation with respect to the void ratio and mean effective stress of the soil is employed to model the consolidation process after the pile installation. The proposed analytical approach has been well validated through comparisons with a finite-element numerical model that involves the entire process from pile installation to loading. The approximate analytical model developed in this work, owing to its relative formulation simplicity, computational efficiency, and prediction reliability, is expected to be able to serve as a feasible analysis method and guidance for the design and construction of piles involving the preboring procedure.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The work reported in this paper is funded by the Louisiana Department of Transportation and Development and the Louisiana Transportation Research Center (Grant No. DOTLT1000208). The first and second authors also would like to acknowledge the financial support provided by the DOT Transportation Consortium of South-Central States (Tran-SET) UTC (No. 19PLSU09).
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 146 • Issue 10 • October 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 26, 2019
Accepted: May 21, 2020
Published online: Jul 17, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 17, 2020
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