Retracted: Relationship between Installation Torque and Axial Capacities of Helical Piles in Cohesionless Soils
This article has been corrected.
VIEW CORRECTIONPublication: Journal of Performance of Constructed Facilities
Volume 29, Issue 6
Abstract
With the rapid growth of the helical piling industry, reliable installation torque estimates and measurements become crucial. This paper presents a theoretical model developed to estimate the torsional resistance of cohesionless soils to helical pile installation. The theoretical torque model was verified using installation records collected from different sites. The paper also highlights factors that affect helical pile installation including soil properties, fluctuation in groundwater levels, shape of pile shaft, pile geometry, and method of helical pile installation. Torque factors, , commonly used in the industry to correlate between installation torque and pile capacities, were also assessed and presented in the paper. The results of the study indicated that the torque factor is a function of the load path (i.e., tension or compression). Therefore torque factors in compression and tension, and , were formulated and presented in the paper.
Get full access to this article
View all available purchase options and get full access to this article.
References
Adams, J. I., and Klym, T. W. (1972). “A study of anchors for transmission tower foundations.” Can. Geotech. J., 9(1), 89–104.
Canadian Geotechnical Society. (2006). Canadian foundation engineering manual, 4th Ed., Technical Committee on Foundations, BiTech Publishers, Richmond, BC.
Cerato, A. B., and Victor, R. (2009). “Effects of long-term loading on fluctuating water table on helical anchor performance for small wind tower foundations.” J. Perform. Constr. Facil., 251–261.
Das, B. M. (1990). Earth anchors, Elsevier, Amsterdam, Netherlands.
Das, B. M., and Seeley, G. R. (1975). “Breakout resistance of horizontal anchors.” J. Geotech. Eng. Div., 101(9), 999–1003.
Deardorff, D. (2011). “A comparison of gear motor performance curves for helical pile installation.” Seminar presented at DFI Helical Foundations and Tiebacks Specialty Seminar, Deep Foundation Institute, Dallas, TX.
Dilley, L., and Hulse, L. (2007). “Foundation design of wind turbines in Southwestern Alaska, a case study.” Proc., Arctic Energy Summit, Institute of the North, Anchorage, AK.
Ghaly, A., and Hanna, A. (1991). “Experimental and theoretical studies on installation torque of screw anchors.” Can. Geotech. J., 28(3), 353–364.
Hawkins, K., and Thorsten, R. (2009). “Load test results—Large diameter helical pipe piles.” Proc., 2009 Int. Foundation Congress and Equipment Expo, Geotechnical Special Publication No. 185, ASCE, Reston, VA, 488–495.
Hoyt, R. M., and Clemence, S. P. (1989). “Uplift capacity of helical anchors in soil.” Proc., 12th Int. Conf. on Soil Mechanics and Foundation Engineering, Vol. 2, 1019–1022.
Kraft, D. C., Davis, J., and Raaf, D. B. (2003). “Use of helical piles set into soft rock for 1500-ton screw press foundation.” Proc., 28th Annual Conf. on Deep Foundations, Deep Foundations Instute, 209–218.
Livneh, B., and El Nagger, M. H. (2008). “Axial testing and numerical modeling of square shaft helical piles under compressive and tensile loading.” Can. Geotech. J., 45(8), 1142–1155.
Perko, H. A. (2001). “Energy method for predicting the installation torque of helical foundations and anchors.” New technologies and design developments in deep foundations, ASCE, Reston, VA, 342–352.
Perko, H. A. (2009). Helical piles: A practical guide to design and installation, Wiley, New York.
Sakr, M. (2009). “Axial and lateral behaviour of helical piles in oil sand.” Can. Geotech. J., 46(9), 1046–1061.
Sakr, M. (2011a). “Helical piles—An effective foundation system for solar plants.” 64th Canadian Geotechnical Conf. and Pan-AM CGS, Deep Foundations Institute, Hawthorne, NJ.
Sakr, M. (2011b). “Installation and performance characteristics of high. Capacity helical piles in cohesionless soils.” Deep Foundations Institute, Hawthorne, NJ.
Sakr, M. (2013). “Relationship between installation torque and axial capacities of helical piles in cohesive soils.” DFI J., 7(1), 44–58.
Sakr, M., Mitchells, R., and Kenzie, J. (2009). “Pile load testing of helical piles and driven steel pipes in anchorage, Alaska.” 34th Annual Deep Foundation Conf., DFI, Kansas City, MO.
Tappenden, K. M. (2007). “Predicting the axial capacity of screw piles installed in Western Canadian soils.” M.Sc. thesis, Univ. of Alberta, Edmonton, AB, Canada.
Tsuha, C. de H. C., and Aoki, N. (2010). “Relationship between installation torque and uplift capacity of deep helical piles in sand.” Can. Geotech. J., 47(6), 635–647.
Zhang, D. J. W. (1999). “Predicting capacity of helical screw piles in Alberta soils.” M.Sc. thesis, Univ. of Alberta, Edmonton, AB, Canada.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 29 • Issue 6 • December 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 18, 2013
Accepted: Apr 21, 2014
Published online: Sep 30, 2014
Discussion open until: Feb 28, 2015
Published in print: Dec 1, 2015
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.