Cyclic and Post-cycling Anchor Response in Geocell-Reinforced Sand

Moghaddas Tafreshi, Seyed Naser; Rahimi, Mohammadyar; Dawson, Andrew; Leshchinsky, Ben

Abstract

Plate anchors are commonly used to resist static, cyclic and monotonic after cyclic-loading uplift loads. Under cyclic loading, progressive sudden failure may occur, characterized by accumulated displacement – even under loads significantly less than the static capacity. Despite extensive usage of geocell for increasing the cyclic resilience, the influence of geocell reinforcements on cyclic uplift capacity is not well-understood. In this study, a series of near-full scale, experimental tests with and without geocell are presented. Results show that the unreinforced system fails cyclically under a load that is almost 70% of its static capacity (Pu), but use of geocell enables stable cyclic resistance of over 100%Pu. For the given soil and configurations, a cyclic displacement rate that reaches less than 0.05 mm/cycle tends to highlight a likely stable response. Evaluation of the soil’s response to cyclic loading demonstrates that, with increasing loading cycles, the loading is increasingly transmitted through the soil close to the anchor in the unreinforced case, but that the reinforced case is less prone to this phenomenon. The monotonic post-cycling capacity of both reinforced and unreinforced anchors decreases after application of cyclic loading; however the unreinforced scenario demonstrates larger decreases in capacity, particularly in the residual state.

Citation

Moghaddas Tafreshi, S. N., Rahimi, M., Dawson, A., & Leshchinsky, B. (2018). Cyclic and Post-cycling Anchor Response in Geocell-Reinforced Sand. Canadian Geotechnical Journal, 56(11), 1700-1718. https://doi.org/10.1139/cgj-2018-0559

• Journal Article Type: Article
• Acceptance Date: Dec 1, 2018
• Online Publication Date: Dec 11, 2018
• Publication Date: Dec 11, 2018
• Deposit Date: Dec 17, 2018
• Publicly Available Date: Dec 17, 2018
• Journal: Canadian Geotechnical Journal
• Print ISSN: 0008-3674
• Electronic ISSN: 1208-6010
• Publisher: NRC Research Press
• Peer Reviewed: Peer Reviewed
• Volume: 56
• Issue: 11
• Pages: 1700-1718
• DOI: https://doi.org/10.1139/cgj-2018-0559
• Keywords: Geotechnical Engineering and Engineering Geology
• Public URL: https://nottingham-repository.worktribe.com/output/1420170
• Publisher URL: http://www.nrcresearchpress.com/doi/10.1139/cgj-2018-0559#.XBKb3Nv7Tix
• Additional Information: © Copyright 2018 – Canadian Science Publishing