Field Performance of the Fish Anchor
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 149, Issue 2
Abstract
The performance of the novel fish anchor has been assessed through field tests. The tests were carried out at three different locations in the Swan River, Perth. The water depths were . The riverbed soils consisted of clay (Location 1), silty clay (Location 2) and silt (Location 3). The anchor was installed in the riverbed by dropping first through an air column followed by a water column, and finally striking the riverbed at an impact velocity of 10.4 (Location 1), 11.43 (Location 2), 11.72 (Location 3) . The anchor tip embedment depth in the riverbed was measured at 1–2.5 times the anchor length. For similar impact velocity, the tip embedment depth in clay was 1.56–1.68 and 2–2.1 times of that in silty clay and silt, respectively. The capacity was found to reduce with loading angle at the padeye to the horizontal. The ultimate capacity was 1.5–2.6 times the weight of the anchor submerged in water for loading angle 90°, which increased to 8.2–15.6 times the weight for . The fish anchor dove, as opposed to pull out of the riverbed, for loading angles , resulting in nonelliptical failure envelopes, which have been expressed mathematically.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research presented here was undertaken with support from a Wooside RiverLab Project and the Australian Research Council (ARC) through the Future Fellowship FT190100735. The first author is an ARC Future Fellow and is supported by the ARC Project No. FT190100735. The work forms part of the activities of the Centre for Offshore Foundation Systems (COFS). This support is gratefully acknowledged.
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© 2022 American Society of Civil Engineers.
History
Received: Sep 28, 2021
Accepted: Sep 28, 2022
Published online: Dec 5, 2022
Published in print: Feb 1, 2023
Discussion open until: May 5, 2023
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