Lateral Performance and Curves for Large-Capacity Helical Piles Installed in Clayey Glacial Deposit
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 10
Abstract
The lateral performance of large-capacity helical piles is of significant interest. This study presents the results of five full-scale lateral load tests conducted on 6.0 and 9.0 m large-capacity helical piles of shaft diameter 324 mm and installed in structured cohesive soil. The piles were either single or double helix, with inter-helix spacing of 1.5 and 3.0 times the helix diameter, instrumented with strain gauges. The shorter piles were tested under a short-term condition, whereas longer piles were tested under a long-term condition. The soil’s curves and its initial modulus of subgrade reaction were back calculated from the strain measurements and were compared with the subgrade modulus estimated from the properties of the undisturbed soils. The pile installation had a significant effect on the subgrade modulus. The number of helices and the inter-helix spacing ratio had minimal influence on the mobilized load deflection at pile head and soil resistances. A reduction factor for the initial subgrade modulus was introduced to be incorporated in design.
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Acknowledgments
The research described herein received direct support from the Natural Sciences and Engineering Research Council of Canada; The University of Western Ontario; Almita Piling Inc., Canada; and Benha University, Egypt.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 29, 2017
Accepted: Jan 10, 2019
Published online: Jul 30, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 30, 2019
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