Mobilized Response of Piles Subjected to Downdrag
Publication: International Journal of Geomechanics
Volume 21, Issue 8
Abstract
This paper presents a model that allows the evaluation of the mobilized response of piles subjected to downdrag and drag forces. The presented technique couples the soil and pile settlement profiles with the pile-mobilized skin friction and end-bearing resistance in an interactive model to determine the downdrag (pile settlement), load distribution along the pile length, and location of the neutral plane or transition zone. The load transfer (t–z and q–z) models employed in the current technique are constructed based on soil and pile properties, soil–pile interaction, and a constitutive soil model. The proposed model detects the variation of the neutral plane location with the increase of pile-head load up to the pile’s geotechnical limit. Additionally, the technique deals with superlong piles under downdrag forces and determines the mobilization of negative (downward) and positive (upward) skin friction with an increase of soil settlement and the effect of the pile’s end-bearing stiffness on developing drag forces. The proposed procedure is described in a detailed flowchart and validated through comparisons with long-term full-scale field tests conducted on piles subjected to negative skin friction.
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Acknowledgments
This research was sponsored by the Alabama Department of Transportation (ALDOT). The authors acknowledge and thank Mr. Scott W. George, Ms. Kaye Chancellor Davis, Mr. Renardo Dorsey, Ms. Michelle Owens, and Mr. Calvin Smith for their support and encouragement.
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International Journal of Geomechanics
Volume 21 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
History
Received: Jun 21, 2020
Accepted: Mar 1, 2021
Published online: May 26, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 26, 2021
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Cited by
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