Effects of Driving Sequence and Spacing on Displacement-Pile Capacity
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 3
Abstract
The installation sequence and spacing of displacement piles can influence the driving resistance (i.e., blow count) and associated capacity, however, engineers can rarely account for this effect in a direct manner. Increasing the availability of high-quality measurements of the effects of driving sequence and spacing to designers could help improve the understanding of production data and inform decisions mid-project. This paper presents some observations of pile driving resistance and pile capacity measured following an experimental program on the use of timber displacement piles in a well-characterized test site. Significant increases in pile capacity were observed as a function of decreased pile spacing depending on the order of installation. After correcting for the estimated residual loads, a fourfold difference in shaft capacity was observed between free-field and a pile in-filled at five pile head diameters.
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Acknowledgments
The authors wish to thank the sponsors of this research, which includes the IDEA Program of the National Cooperative Highway Research Program, National Academy of Science, under Grant NCHRP-180, and the South Carolina chapter of the Pile Driving Contractors Association (PDCA). The authors gratefully acknowledge the significant effort by Van Hogan, formerly of the PDCA, as well as the member firms that have contributed materials, labor, and equipment: Pile Drivers, Inc., S&ME, Inc., Soil Consultants, Inc., Chuck Dawley Surveying, Cox Wood Industries, and Hayward Baker, Inc. We also wish to thank the reviewers for their constructive comments and suggestions.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 3 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 29, 2016
Accepted: Jul 19, 2016
Published online: Sep 22, 2016
Discussion open until: Feb 22, 2017
Published in print: Mar 1, 2017
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