Influence of Dilation Angle on Drained Shallow Circular Anchor Uplift Capacity
This article has been corrected.
VIEW CORRECTIONPublication: International Journal of Geomechanics
Volume 17, Issue 2
Abstract
An experimental study of uplift capacity of 22 circular helical anchors installed in sand with peak friction angles between 40 and 50° was performed. Laboratory triaxial tests indicated that the dilation angle varied between 10 and 25° for these peak friction angles. To account for soil behavior exhibiting nonassociated flow (NAF), in which the dilation angle is much less than the friction angle, a limit equilibrium plane strain analytical solution for plate anchor uplift was updated and extended to axisymmetric conditions. Anchor test results were compared with upper bound (UB) plasticity solutions (based on associated flow) and the newly developed NAF limit equilibrium model. The UB solution overpredicted uplift capacity by more than a factor of 2, whereas the limit equilibrium model had a ratio of calculated to measured capacity of 1.15 and a coefficient of variation of 0.14. Although additional study is warranted, the consistency among the numerical, analytical, and experimental results gives confidence in the further application of the NAF limit equilibrium analytical solution presented in this paper.
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Acknowledgments
The authors acknowledge Optum CE for an advanced version of Optum G2 that includes axisymmetric analyses. The first and second authors acknowledge that this material is based upon work partially supported by the National Science Foundation under Grant No. 1300142. The third author acknowledges support for work on this paper through a Martin Fahey Visiting Fellowship at the University of Western Australia, Centre for Offshore Foundation Systems. Last, the authors thank Marcus Rasulo for the useful comments that improved this paper.
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Published In
International Journal of Geomechanics
Volume 17 • Issue 2 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 11, 2015
Accepted: Apr 19, 2016
Published online: Jun 8, 2016
Discussion open until: Nov 8, 2016
Published in print: Feb 1, 2017
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