Full-Scale Testing of Open-Ended Steel Pipe Piles in Thick Varved Clayey Silt Deposits along the Delaware River in New Jersey
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 3
Abstract
Although many studies have been done to investigate the axial behaviors of open-ended piles in sands, few studies have been reported for weak clayey silts. To develop reliable models for the design of open-ended steel-pipe piles driven into 29-m-thick varved clayey silt deposits, a series of full-scale field load tests including large-strain dynamic tests and static cyclic axial-compression-load tests was conducted on two groups of instrumented piles. Through analysis of the test data, soil parameters were back-calculated for estimation of pile capacities using the static-bearing-capacity formulas and cone-resistance-based methods. The comparisons between the calculated results and the field load test data demonstrated that the following considerations can be adopted in the design of static compression capacities of an open-ended pipe pile penetrating through thick varved clayey silts to end-bearing in dense cohesionless soils: (1) a fully plugged condition can be assumed, (2) cone resistance with an upper limit of 4,788 kPa (100 ksf) can be used for unit base resistance on the soil plug, and (3) exterior unit shaft resistance can be estimated using two-thirds of the total unit shaft resistance.
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Acknowledgments
Many organizations and people contributed to the success of this research project, and special thanks are due to Mr. Junius Allen of BP and the former Geotechnical Engineers of WPC, Inc., i.e., Mr. Wu Yang, Mr. Joshua Adams, Mr. Jian Fang, Mr. Donovan Ledford, and Dr. Ed Hajduk. The financial support offered by NSFC Grant No. 51109125, the Fundamental Research Funds for the Central Univs. No. 0230219134, Innovation Program of Shanghai Municipal Education Commission No.13ZZ027, and the project sponsored by SRF for ROCS, SEM are gratefully acknowledged. Dr. Ye Lu from Shanghai Univ. is appreciated for her contribution to improving the quality of this paper. Finally, the insightful comments and suggestions from the three anonymous reviewers, the Associate Editor, and the Editor are sincerely appreciated.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 3 • March 2013
Pages: 518 - 524
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 19, 2011
Accepted: May 14, 2012
Published online: May 17, 2012
Published in print: Mar 1, 2013
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