Installation of dynamically embedded plate anchors as assessed through field tests
Installation of dynamically embedded plate anchors as assessed through field tests
A dynamically embedded plate anchor (DEPLA) is a rocket-shaped anchor that comprises a removable central shaft and a set of four flukes. The DEPLA penetrates to a target depth in the seabed by the kinetic energy obtained through free-fall in water. After embedment the central shaft is retrieved leaving the anchor flukes vertically embedded in the seabed. The flukes constitute the load-bearing element as a plate anchor. This paper focuses on the dynamic installation of the DEPLA. Net resistance and velocity profiles are derived from acceleration data measured by an inertial measurement unit during DEPLA field tests, which are compared with corresponding theoretical profiles based on strain rate–enhanced shear resistance and fluid mechanics drag resistance. Comparison of the measured net resistance force profiles with the model predictions shows fair agreement at 1:12 scale and good agreement at 1:7.2 and 1:4.5 scales. For all scales the embedment model predicts the final anchor embedment depth to a high degree of accuracy.
1270-1282
Blake, A.P.
e0438bea-cfc4-4373-b100-8b9768ddc56f
O’Loughlin, C.D.
383cd471-d629-48b7-86c5-54ac583806d7
30 January 2015
Blake, A.P.
e0438bea-cfc4-4373-b100-8b9768ddc56f
O’Loughlin, C.D.
383cd471-d629-48b7-86c5-54ac583806d7
Blake, A.P. and O’Loughlin, C.D.
(2015)
Installation of dynamically embedded plate anchors as assessed through field tests.
Canadian Geotechnical Journal, 52 (9), .
(doi:10.1139/cgj-2014-0327).
Abstract
A dynamically embedded plate anchor (DEPLA) is a rocket-shaped anchor that comprises a removable central shaft and a set of four flukes. The DEPLA penetrates to a target depth in the seabed by the kinetic energy obtained through free-fall in water. After embedment the central shaft is retrieved leaving the anchor flukes vertically embedded in the seabed. The flukes constitute the load-bearing element as a plate anchor. This paper focuses on the dynamic installation of the DEPLA. Net resistance and velocity profiles are derived from acceleration data measured by an inertial measurement unit during DEPLA field tests, which are compared with corresponding theoretical profiles based on strain rate–enhanced shear resistance and fluid mechanics drag resistance. Comparison of the measured net resistance force profiles with the model predictions shows fair agreement at 1:12 scale and good agreement at 1:7.2 and 1:4.5 scales. For all scales the embedment model predicts the final anchor embedment depth to a high degree of accuracy.
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Accepted/In Press date: 18 January 2015
Published date: 30 January 2015
Organisations:
Faculty of Engineering and the Environment
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Local EPrints ID: 403624
URI: http://eprints.soton.ac.uk/id/eprint/403624
ISSN: 0008-3674
PURE UUID: 65dc9f5d-2001-48c7-91bb-a7d9300f5abf
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Date deposited: 06 Dec 2016 14:16
Last modified: 15 Mar 2024 03:47
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Author:
C.D. O’Loughlin
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