Cyclic Capacity and Diving Potential of Novel Fish Anchor in Calcareous Silt

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Abstract

This paper reports the performance of a novel dynamically installed fish anchor under cyclic operational loading in calcareous silt. The investigation was carried out through a series of centrifuge model tests. The results demonstrate that the pullout capacity of the fish dynamically installed anchor (DIA) subjected to cyclic loading is dependent on the combination of cyclic mean load, cyclic load amplitude, and number of cycles. A design contour is proposed for estimating the anchor capacity under various magnitudes of cyclic load. The evolution of anchor displacement, inclination, and excess pore pressure are quantified and their influences on the fish DIA capacity are highlighted. With a tip embedment depth of 1.02-1.43 times the anchor length during dynamic installation, the fish DIA was found to dive in calcareous silt for mooring mudline inclinations ≤ 45° under both monotonic and cyclic operational loadings, whereas by contrast, the OMNI-Max anchor with tip embedment of 1.4-2 times the anchor length did not dive for inclinations as low as 1°-10°. As such, the fish DIA has the potential for efficient anchoring to allow economic development of oil and gas reserves in deep water with calcareous seabed sediments.

Original languageEnglish
Article number04019054
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume145
Issue number9
DOIs
Publication statusPublished - 1 Sep 2019

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Silt
diving
Anchors
anchor
Fish
silt
fish
Cyclic loads
Mooring
Pore pressure
Centrifuges
cyclic loading
centrifuge
model test
pore pressure
Loads (forces)
Sediments
economic development
deep water
Economics

Cite this

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title = "Cyclic Capacity and Diving Potential of Novel Fish Anchor in Calcareous Silt",
abstract = "This paper reports the performance of a novel dynamically installed fish anchor under cyclic operational loading in calcareous silt. The investigation was carried out through a series of centrifuge model tests. The results demonstrate that the pullout capacity of the fish dynamically installed anchor (DIA) subjected to cyclic loading is dependent on the combination of cyclic mean load, cyclic load amplitude, and number of cycles. A design contour is proposed for estimating the anchor capacity under various magnitudes of cyclic load. The evolution of anchor displacement, inclination, and excess pore pressure are quantified and their influences on the fish DIA capacity are highlighted. With a tip embedment depth of 1.02-1.43 times the anchor length during dynamic installation, the fish DIA was found to dive in calcareous silt for mooring mudline inclinations ≤ 45° under both monotonic and cyclic operational loadings, whereas by contrast, the OMNI-Max anchor with tip embedment of 1.4-2 times the anchor length did not dive for inclinations as low as 1°-10°. As such, the fish DIA has the potential for efficient anchoring to allow economic development of oil and gas reserves in deep water with calcareous seabed sediments.",
keywords = "Anchors, Centrifuge modeling, Offshore engineering, Repeated loading, Silts",
author = "K. Chang and Hossain, {M. S.} and Kim, {Y. H.} and D. Wang",
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journal = "Journal of Geotechnical and Geoenvironmentral Engineering",
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AU - Hossain, M. S.

AU - Kim, Y. H.

AU - Wang, D.

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N2 - This paper reports the performance of a novel dynamically installed fish anchor under cyclic operational loading in calcareous silt. The investigation was carried out through a series of centrifuge model tests. The results demonstrate that the pullout capacity of the fish dynamically installed anchor (DIA) subjected to cyclic loading is dependent on the combination of cyclic mean load, cyclic load amplitude, and number of cycles. A design contour is proposed for estimating the anchor capacity under various magnitudes of cyclic load. The evolution of anchor displacement, inclination, and excess pore pressure are quantified and their influences on the fish DIA capacity are highlighted. With a tip embedment depth of 1.02-1.43 times the anchor length during dynamic installation, the fish DIA was found to dive in calcareous silt for mooring mudline inclinations ≤ 45° under both monotonic and cyclic operational loadings, whereas by contrast, the OMNI-Max anchor with tip embedment of 1.4-2 times the anchor length did not dive for inclinations as low as 1°-10°. As such, the fish DIA has the potential for efficient anchoring to allow economic development of oil and gas reserves in deep water with calcareous seabed sediments.

AB - This paper reports the performance of a novel dynamically installed fish anchor under cyclic operational loading in calcareous silt. The investigation was carried out through a series of centrifuge model tests. The results demonstrate that the pullout capacity of the fish dynamically installed anchor (DIA) subjected to cyclic loading is dependent on the combination of cyclic mean load, cyclic load amplitude, and number of cycles. A design contour is proposed for estimating the anchor capacity under various magnitudes of cyclic load. The evolution of anchor displacement, inclination, and excess pore pressure are quantified and their influences on the fish DIA capacity are highlighted. With a tip embedment depth of 1.02-1.43 times the anchor length during dynamic installation, the fish DIA was found to dive in calcareous silt for mooring mudline inclinations ≤ 45° under both monotonic and cyclic operational loadings, whereas by contrast, the OMNI-Max anchor with tip embedment of 1.4-2 times the anchor length did not dive for inclinations as low as 1°-10°. As such, the fish DIA has the potential for efficient anchoring to allow economic development of oil and gas reserves in deep water with calcareous seabed sediments.

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KW - Centrifuge modeling

KW - Offshore engineering

KW - Repeated loading

KW - Silts

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