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Experimental and numerical investigation of the uplift capacity of plate anchors in geocell-reinforced sand

Rahimi, M.; Moghaddas Tafreshi, S.N.; Leshchinsky, B.; Dawson, Andrew

Authors

M. Rahimi

S.N. Moghaddas Tafreshi

B. Leshchinsky

Andrew Dawson



Abstract

Plate anchors are frequently used to provide resistance against uplift forces. This paper describes the reinforcing effects of a geocell-reinforced soil layer on uplift behavior of anchor plates. The uplift tests were conducted in a test pit at near full-scale on anchor plates with widths between 150 and 300 mm with embedment depths of 1.5–3 times the anchor width for both unreinforced and geocell-reinforced backfill. A single geocell layer with pocket size 110 mm × 110 mm and height 100 mm, fabricated from non-perforated and nonwoven geotextile, was used. The results show that the peak and residual uplift capacities of anchor models were highest when the geocell layer over the anchor was used, but with increasing anchor size and embedment depth, the benefit of the geocell reinforcement deceases. Peak loads between 130% and 155% of unreinforced conditions were observed when geocell reinforcement was present. Residual loading increased from 75% to 225% that of the unreinforced scenario. The reinforced anchor system could undergo larger upward displacements before peak loading occurred. These improvements may be attributed to the geocell reinforcement distributing stress to a wider area than the unreinforced case during uplift. The breakout factor increases with embedment depth and decreased with increasing anchor width for both unreinforced and reinforced conditions, the latter yielding larger breakout factors. Calibrated numerical modelling demonstrated favorable agreement with experimental observations, providing insight into detailed behavior of the system. For example, surface heave decreased by over 80% when geocell was present because of a much more efficient stress distribution imparted by the presence of the geocell layer.

Citation

Rahimi, M., Moghaddas Tafreshi, S., Leshchinsky, B., & Dawson, A. (2018). Experimental and numerical investigation of the uplift capacity of plate anchors in geocell-reinforced sand. Geotextiles and Geomembranes, 46(6), https://doi.org/10.1016/j.geotexmem.2018.07.010

Journal Article Type Article
Acceptance Date Jul 12, 2018
Online Publication Date Jul 25, 2018
Publication Date Dec 1, 2018
Deposit Date Jul 26, 2018
Publicly Available Date Jul 26, 2019
Journal Geotextiles and Geomembranes
Print ISSN 0266-1144
Electronic ISSN 0266-1144
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 46
Issue 6
DOI https://doi.org/10.1016/j.geotexmem.2018.07.010
Keywords Geosynthetics, Plate anchor, Geocell layer, Uplift load, Upward displacements, Numerical analysis
Public URL http://eprints.nottingham.ac.uk/id/eprint/53161
Publisher URL https://www.sciencedirect.com/science/article/pii/S0266114418300712?via%3Dihub
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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