Geometric Effects on Piles in Consolidating Ground: Centrifuge and Numerical Modeling
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 9
Abstract
Although semi-open H piles have been widely used, geometric effects (GEs) on H-shaped piles in consolidating ground subjected to negative skin friction (NSF) and downdrag are still not well investigated or understood. This paper reports three centrifuge model tests to investigate the responses of one semi-open pile (i.e., H-shaped cross-section) and two solid piles (i.e., circular and rectangular cross-sections) in a consolidating clay stratum. In addition, corresponding three-dimensional (3D) numerical back-analyses considering the elastoplastic slip at the pile–soil interface were carried out and discussed. It is found that the normalized downdrag of the H pile is the largest because the dragload distributed on the end bearing area is the largest among the three piles. The neutral planes of the circular, rectangular, and H piles are located at the normalized depths of , 0.82, and 0.75, respectively. This is because the H pile is subjected to “hang-up” effects due to vertical shearing inside the flanges and web, resulting in a shallower depth of the neutral plane and hence the smallest dragload. Even the average NSF of the H pile is smaller than those of the solid circular and rectangular piles; the largest downdrag induced by consolidating soil should be addressed carefully in the design.
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Acknowledgments
The authors would like to acknowledge the support of the National Natural Science Foundation of China under Contract No. 51408607, China Postdoctoral Science Foundation No. 2016T90464, and Basic Research Program of China No. 2013CB036005.
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©2017 American Society of Civil Engineers.
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Received: Apr 29, 2015
Accepted: Jan 24, 2017
Published online: Apr 19, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 19, 2017
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