Termination Criteria for Jacked Pile Construction and Load Transfer in Weathered Soils
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 7
Abstract
Pile jacking is a piling technique that provides a noise- and vibration-free environment in the construction site. To improve termination criteria for pile jacking and to better understand the behavior of jacked piles, two steel H piles were instrumented, installed at a weathered soil site, and load tested. A set of termination criteria was applied to the test piles, which includes a minimum blow count from the standard penetration test, a specified final jacking force, a minimum of four loading cycles at the final jack force, and a specified maximum rate of pile settlement at the final jacking force. The two test piles passed all required acceptance criteria. Punching shear failure occurred at the failure load for both piles and the shaft resistance consisted of approximately 80% of the pile capacity. Based on the results of field tests in Hong Kong and Guangdong and several centrifuge tests, a relation between the ratio of the pile capacity to the final jacking force and the pile slenderness ratio is established. The ratio is larger than 1.0 for long piles but may be smaller than 1.0 for short piles. A regression equation is established to determine the final jacking force, which is suggested as a termination criterion for jacked piles. The final jacking force can be smaller than 2.5 times the design load for very long piles, but should be larger than 2.5 times the design load for piles shorter than 37 times the pile diameter.
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Acknowledgments
This research was funded by the Housing Authority Research Fund (Agreement No. UNSPECIFIEDB20030027). A Research Management Team was formed to oversee the research activities. The team members included Dr. Hon-Wah Pang, and Messrs. Chan-Fai Pang, Chi-On Chan, Martin W. T. Tsoi, and C. F. Tang. The contractor for the static loading tests was Gammon Skanska Ltd. The Housing Authority donated the instrumented pile RJP-1. Foundation Technique Ltd. provided HKUST data loggers for testing RJP-1. The generous support of the three organizations and the technical input from the Management Team members are cordially acknowledged. The writers would also like to thank the following individuals in planning, coordinating and conducting the field tests: Messrs. T. Y. Mak and William Tang of the Housing Authority, Mr. Raymond Leung of Gammon Skanska Ltd., Mr. W. C. Yue of Foundation Technique Ltd., and Dr. H. Wang, Mr. O. S. Ho, and Miss Jenny Ng of HKUST.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 7 • July 2006
Pages: 819 - 829
Copyright
© 2006 ASCE.
History
Received: Aug 9, 2005
Accepted: Nov 15, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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