Pile Spacing Effects on Lateral Pile Group Behavior: Load Tests
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VIEW THE ORIGINAL ARTICLEPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 10
Abstract
To investigate group interaction effects as a function of pile spacing, full-scale cyclic lateral load tests were performed on pile groups in stiff clay spaced at 3.3, 4.4, and 5.65 pile diameters in the direction of loading with as many as five rows of piles. Group interaction effects decreased considerably as pile spacing increased from 3.3 to . Lateral resistance was a function of row location in the group, rather than location within a row. For a given deflection, the leading (first) row piles carried the greatest load, while the second and third row piles carried successively smaller loads. Fourth and fifth row piles carried about the same load as the third row piles. For a given load, the maximum bending moments in the trailing row piles were greater than those in the lead row, but these effects decreased as spacing increased. Cyclic loading reduced the peak load by about 15% after 15 cycles; however, distribution of load within the pile group was essentially the same as at the peak load. Gaps significantly reduced resistance for small deflections.
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Acknowledgments
This project was supported by the Departments of Transportation from the states of Arizona, California, New York, Utah, and Washington through a pooled-fund arrangement. This support is greatly appreciated. The Utah Dept. of Transportation served as the lead agency with Sam Musser and Blaine Leonard as the Project Managers. Doug Alexander, Tom Shantz, Paul Bailey, and David Sowers served on the Technical Advisory Panel. However, the views and recommendations expressed in this paper do not necessarily reflect those of the sponsors. Build, Inc. provided personnel and pile driving equipment at cost and this contribution is appreciated. Finally, the writers thank David Anderson, the BYU Civil Engineering Department Technician, for his invaluable efforts during the testing and for debugging the data acquisition system.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 10 • October 2006
Pages: 1262 - 1271
Copyright
© 2006 ASCE.
History
Received: Mar 26, 2004
Accepted: Mar 9, 2006
Published online: Oct 1, 2006
Published in print: Oct 2006
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