Field Experiments on Cyclic Behaviors of Axially Loaded Piles Jacked in Soft Clay
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 3
Abstract
Pipe piles are increasingly used to support embankments of high-speed railways. This study presents a series of static and cyclic axial loading tests on two industrial prestressed-concrete pipe piles installed on a field site with soft clay in Huzhou, southeastern China. The 29.5-m-long preinstrumented piles were subjected to different loading combinations of static load () and cyclic load () to maximum numbers of 50,000 cycles. The geotechnical details of the testing site and the instrumentations were explored before characterizing the accumulated displacement at the pile head. Preliminary results reveal that pile compressive capacities increased significantly after cyclic loadings. The cyclic behaviors of the pile-head displacement are classified into three patterns: quickly stabilized, progressively developing, and dramatically failed. Correspondingly, cyclic stability criteria are identified as stable zone, metastable zone, and unstable zone. Stable utilization line, critical utilization line, and ultimate utilization line are proposed to divide these three zones. For some cases under the same total load, the accumulated settlements of the piles are, however, different, depending largely on the cyclic loading level.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was carried out with support from the Hunan Provincial Science and Technology Department (Grant No. 2019RS1030). The authors are grateful to professorate senior engineer Zhenghui Jiang from Zhejiang Institute of Communications Co. for providing the testing site. The authors also express their thanks to Mr. Yong Xu and Mr. Wei Cheng from the Geotechnical Institute of Zhejiang University for their help with the experiments.
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© 2020 American Society of Civil Engineers.
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Received: Dec 17, 2019
Accepted: Sep 15, 2020
Published online: Dec 22, 2020
Published in print: Mar 1, 2021
Discussion open until: May 22, 2021
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