Loading performance of fish and OMNI-Max anchors in crust-over-soft clays

Kim, Y. H.; Hossain, Muhammad Shazzad; Lee, J.K.

doi:10.1016/j.apor.2019.101904

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…However, previous studies have mainly focused on the embedment depth and bearing capacity of fish anchors in the seabed [9,12,13]. Few studies have reported the hydrodynamic characteristics of the free-fall process of fish anchors in water, and comparative studies on the advantages and disadvantages of fish and torpedo anchors are lacking.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic and bearing behaviors of two typical deepwater dynamically installed anchors: torpedo anchor and fish anchor

Zhang,

Fu,

Zhang

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Dynamically installed anchors, such as torpedo and fish anchors, are innovative and cost-effective anchorage foundations. In this study, the advantages and disadvantages of these two types of dynamically installed anchors are discussed by comparing the hydrodynamic and bearing characteristics of torpedo and fish anchors commonly used in practical engineering. First, based on OpenFOAM, 3D numerical models were established to investigate the directional stability and simulate the underwater free-fall process of anchors using static and dynamic model analysis methods. Using the validated model, the hydrodynamic performances (i.e., inclination angle, installation offset distance, penetration velocity, and drag coefficient) of torpedo and fish anchors were explored and compared. Based on these findings, the installation height of each anchor was recommended. Finally, the bearing performances of the torpedo and fish anchors were investigated using ABAQUS, and the selection principles of these two types of dynamically installed anchors were presented based on their hydrodynamic and bearing behaviors.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic and bearing behaviors of two typical deepwater dynamically installed anchors: torpedo anchor and fish anchor

Zhang,

Fu,

Zhang

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The study also analyzed the effects of padeye offset ratio and loading angle on the motion trajectory and pull-out capacity of fish anchors in soil. Furthermore, Kim et al (2019) compared the penetration performance and pull-out capacity between fish anchors and OMNI-Max anchors under identical working conditions in crust-over-soft clay. Chang et al (2019a;2019b) studied the penetration and pull-out capacity of fish anchors in calcareous silt through centrifuge tests.…”

Section: Introductionmentioning

confidence: 99%

An innovative booster-assisted dynamically installed fish anchor and its installation characteristics considering the action of ocean currents

Zhang,

2024

Physics of Fluids

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The fish anchor is an economically viable offshore foundation engineering technology that has been proposed in recent years. By fish anchor, we mean a fish-shaped dynamically installed anchor that can penetrate into the seabed through water by its own weight. However, the existing research studies seldom consider the hydrodynamic characteristics of its free fall installation, resulting in uncertainties regarding its underwater installation characteristics. Therefore, based on OpenFOAM, this study first investigated the directional stability of fish anchors during its underwater falling process through the static model analysis method and dynamic model analysis method. The findings indicated that the directional stability of fish anchors was insufficient, rendering them suitable only for release and installation at low heights (i.e., less than 4.2 times the anchor length) without marine environmental loads. Furthermore, the anchor inclination angle during installation is significant, thereby impacting its penetration depth and pull-out capacity in the seabed. To solve this problem, the concept of an innovative booster-assisted fish anchor is proposed, which can significantly enhance the directional stability of conventional fish anchors. Results show that the maximum installation height of the new booster-assisted fish anchor is increased by 2.4 times compared to the original design, thereby enhancing both the penetration speed and uplift capacity. Based on the findings, recommended installation and construction conditions are provided. Finally, a predictive formula for the installation height and verticality of the new booster-assisted fish anchor under current action is presented to offer guidance for engineering applications.

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