Experimental study on the stability of plate anchors in clay under cyclic loading

Yu, Long; Zhou, Qi; Liu, Jun

doi:10.1016/j.taml.2015.02.005

Cited by 17 publications

(7 citation statements)

References 15 publications

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“…One-way cycling was previously considered to have limited negative/detrimental effect on the cyclic pullout capacity, the reduction of which could be compensated by increasing shear strength of the soil in front of the anchor due to the consolidation under the sustained loading. Nevertheless, recent experimental test results indicated that there exists a threshold of cyclic loading (fraction of the pullout capacity), beyond which the plate anchor may experience failure due to large displacement and stiffness degradation of the plate-soil interaction system [104,108,109].…”

Section: Cyclic Pullout Capacitymentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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As the offshore engineering moving from shallow to deep waters, the foundation types for fixed and floating platforms have been gradually evolving to minimize engineering costs and structural risks in the harsh offshore environments. Particular focus of this paper is on the foundation instability and its failure mechanisms as well as the relevant theory advances for the prevailing foundation types in both shallow and deep water depths. Piles, spudcans, gravity bases, suction caissons, and plate anchors are detailed in this paper. The failure phenomena and mechanisms for each type of foundations are identified and summarized, respectively. The theoretical approaches along with sophisticated empirical solutions for the bearing capacity problems are then presented. The major challenges are from flow-structure-soil coupling processes, rigorous constitutive modeling of cyclic behaviors of marine sediments, and the spatial variability of soil properties for large-spreading structures. Further researches are suggested to reveal the instability mechanisms for underpinning the evolution of offshore foundations. Citation:Gao F P, Li J H, Qi W G, et al. On the instability of offshore foundations: theory and mechanism.

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Section: Cyclic Pullout Capacitymentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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“…The offshore oil and gas industry has used these anchors for both permanent and temporary moorings. Various experimental studies have been reported on drag anchors (Dunnavant and Kwan 1993;Neubecker and Randolph 1996a;Ozmutlu 2009;Liu et al 2010b;Shin et al 2011;Yu et al 2015). Similarly, analytical studies have been reported (Lelievre and Tabatabaee 1981;Degenkamp and Dutta 1989;Stewart 1992;Randolph 1995, 1996b;Thorne 1998;O'Neill et al 2003;Aubeny and Chi 2010;Liu et al 2010aLiu et al , 2012.…”

Section: Introductionmentioning

confidence: 87%

Pullout Capacity of Single and Biwing Anchors in a Soft Clay Deposit: Model Investigation in a Centrifuge and FEM Predictions

Fanning¹,

Sivakumar

Nanda

et al. 2023

J. Geotech. Geoenviron. Eng.

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One of the ways to install plate anchors in deep seabed is to drop the anchor system from the sea level and allow it to initially embed in the seabed under its own weight. Further dragging would cause the anchor to rotate and embed further into the seabed. There could be difficulties of getting the anchor plate horizontal or mooring line to be perpendicular to the plate where the maximum pullout capacity could be achieved. As part of the investigations, various aspects of the plate performance were examined through centrifuge testing in which the plate orientation and pullout angles were varied. It was presumed that dynamic stability of the anchor (during field installation) can be achieved by having the plate in biwing configuration. Therefore, the performance of the biwing anchors having different spacing between the plates was also examined in the centrifuge testing program and the findings were compared with predictions obtained through finite-element modeling (FEM). Both pullout directions and the plate angles considerably influenced the pullout capacity factors. The comparison between the predicted pullout capacity using FEM and measured pullout capacity for biwing anchors at shallow embedment depths was excellent. However, the FEM-predicted pullout capacity was noticeably lower than the measured ones for deep anchors. Pullout capacity of biwing anchors at shallow embedment depth increased as the spacing between the plates S increased from 0 to 0.5B. However, there appears to be a slight reduction in the performance in deep embedment anchors. This is also reflected in FEM findings.

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“…Proceedings of the Institution of Civil Engineers -Geotechnical Engineering, https://doi.org/10.1680/jgeen.22.00245 clay varied with anchor shape, soil strength and the depth below the seabed, normalised by anchor width (Aubeny, 2019;Das and Seeley, 1975;Giampa et al, 2019;Jalilvand et al, 2022;Lai et al, 2020;Liu et al, 2010Liu et al, , 2012Meyerhof and Adams, 1968;Neubecker and Randolph, 1996;O'Neill et al, 2003;Roy et al, 2021aRoy et al, , 2021bSahoo and Ganesh, 2018;Thorne, 1998;Vesic, 1971: Yu et al, 2015: Zhuang et al, 2022. Novel concepts such as the suction embedded plate anchor (Zook and Keith, 2009), OMNI-Max anchor (Kim and Hossain, 2017), multiline ring anchor (Lee et al, 2021, Lee andAubeny, 2020), fish anchor (Chang et al, 2019, Hossain et al, 2023 and dynamically embedded plate anchor (O'Loughlin et al, 2014) have been developed in recent years.…”

Section: Cite This Articlementioning

confidence: 99%

An anchoring system for supporting platforms for wind energy devices

Sivakumar

Fanning

Gavin³

et al. 2023

Proceedings of the Institution of Civil Engineers - Geotechnica

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This paper presents data from an initial development stage of an ‘umbrella anchor’ concept. The anchor can be pushed into sand deposit in a folded arrangement to reduce installation loads. When a pull-out load is applied to the mooring line, the anchor deploys to create a large embedded plate anchor. Physical modelling was carried out in saturated sand-bed with the anchor installed at depths of up to 1.6 m and loaded vertically. During installation, liquefaction was generated at the tip of the anchor to reduce the penetration resistance. This enabled the anchor to be installed quickly and accurately to a target depth. The anchor could provide pull-out resistances comparable to anchor that was wished-in-place at similar depths. The observed behaviour provided encouraging preliminary results and suggests that, with further development and analysis, the concept could potentially be used for commercial applications.

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Experimental study on the stability of plate anchors in clay under cyclic loading

Cited by 17 publications

References 15 publications

On the instability of offshore foundations: theory and mechanism

On the instability of offshore foundations: theory and mechanism

Pullout Capacity of Single and Biwing Anchors in a Soft Clay Deposit: Model Investigation in a Centrifuge and FEM Predictions

An anchoring system for supporting platforms for wind energy devices

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