Numerical Evaluation of Drag Force on Integral Abutment Piles
Publication: Journal of Bridge Engineering
Volume 28, Issue 9
Abstract
Piles transmit structural loads through skin friction, end-bearing, or both to deeper and stronger soil layers. Surcharge loads, site grading, or dewatering activities induce downward movement in the soil that is adjacent to piles installed in a compressible soil layer. This movement causes negative skin friction stresses that act downward at the pile–soil interface, which causes an additional force denoted the drag force (Qn) that is applied to the pile, which results in a larger axial load in the pile shaft. The end-bearing force and positive skin friction that develops in the pile part within stable (incompressible) soil resist the applied loads [e.g., dead load (Qd) and Qn]. This paper aimed to evaluate Qn that was mobilized on driven H-piles that were installed in soft clay with three-dimensional (3D) nonlinear finite-element analysis. Two numerical models were validated against the field data from two instrumented H-piles, which were part of a three-span bridge (E-21) on Highway 418, Ontario, Canada. The calculated settlements and Qn agreed well with measured field data. The validated numerical models were employed to conduct a parametric analysis to investigate the location of the neutral plane (NP) at which the skin friction changed from negative to positive. In addition, the performance of the piles that were installed in small and large groups was investigated, which considered Qn and group effects. It was found that the group effect was negligible for piles that were installed in one row but were significant for piles that were installed in large groups. Finally, a group factor was proposed to calculate the drag force for piles in a group (Q(n)pile in group).
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Acknowledgments
The authors would like to recognize the Ministry of Transportation Ontario (MTO) for supporting the project financially and managing the installation of the field monitoring instruments. Special thanks to Mr. Tony Sangiuliano from MTO and Mr. James Ng from Blackbird Constructors 407 GP for facilitating the fieldwork and the instrumentation installation.
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Published In
Journal of Bridge Engineering
Volume 28 • Issue 9 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 4, 2022
Accepted: Mar 26, 2023
Published online: Jun 16, 2023
Published in print: Sep 1, 2023
Discussion open until: Nov 16, 2023
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