The kinematic behaviour of drag anchors in sand

Neubecker, S.R.; Randolph, Mark

doi:10.1139/t96-084-306

Cited by 39 publications

(12 citation statements)

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“…The anchor trajectory is a key parameter that can be used for interpretation of the obtained holding capacities and reliability indexes in the later stages. The solution proposed by Neubecker and Randolph (1996c) for prediction of the anchor trajectory was adopted, where three main conditions were set to ensure kinematic admissibility of the anchor model. These conditions put constraints on the absolute and relative displacements of the anchor and the soil wedge and hence are helpful in defining the kinematics of the system.…”

Section: Anchor Kinematicsmentioning

confidence: 99%

“…However, the adopted solution (Neubecker and Randolph, 1996a) benefits from several advantages such as simplified prediction of the anchor capacity and trajectory, incorporation of chain-sand interaction, and comprehensive validation against the experimental studies (Neubecker and Randolph, 1996a;Neubecker and Randolph, 1996b;O'Neill et al, 1997). This model has been widely used in several studies in the literature (Neubecker and Randolph, 1996b;Neubecker and Randolph, 1996c;O'Neill et al, 2003) and recommended by design codes (e.g., API RP 2SK, 2008). The mooring line tensions were obtained by performing dynamic mooring analysis using OrcaFelx Fig.…”

Section: Introductionmentioning

confidence: 99%

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Reliability assessment of drag embedment anchors in sand and the effect of idealized anchor geometry

Aslkhalili

Shiri

Zendehboudi

2020

Saf. Extreme Environ.

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In this study, the reliability of drag embedment anchors in the sand was assessed and the effect of anchor geometrical idealization on reliability indices was investigated as an inherited characteristic of analytical approaches. The anchor holding capacity was obtained by performing a series of iterative limit state analyses and a probabilistic model was developed for the selected anchor families. The tensions of the mooring lines connected to a semisubmersible platform were obtained by performing a series of time-domain dynamic mooring analyses using the OrcaFlex software. The uncertainties in environmental loads, metocean variables, and stress distribution along the catenary mooring lines were incorporated into the line tensions through the response surfaces. An iterative procedure was performed by adopting the first-order reliability method (FORM) to calculate the comparative failure probabilities in sand and clay. The study showed significant dependence of the anchoring system reliability on geometrical configuration of anchors, the seabed soil properties, and the environmental loads. It was observed that the implementation of the reliability-based design into the existing in-filed trial procedures could significantly improve the efficiency and cost-effectiveness of the design practice.

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Section: Anchor Kinematicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability assessment of drag embedment anchors in sand and the effect of idealized anchor geometry

Aslkhalili

Shiri

Zendehboudi

2020

Saf. Extreme Environ.

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“…Clearer mechanisms of keying, translating and diving of different types of anchors are required, which would enhance the understanding of anchor-seabed-line interactional problems brought about by emerging deepwater anchors. Previous studies were performed on drag anchors (Neubecker and Randolph, 1996a;1996b;Thorne, 1998;O'Neill and Randolph, 2001;O'Neill et al, 2003;Liu et al, 2010a;Aubeny and Chi, 2010;Liu et al, 2012b;Zhang et al, 2014;Zhao and Liu, 2015;, SEPLAs (Song et al, 2008;Yu et al, 2009;Wang et al, 2011;Yang et al, 2012;Cassidy et al, 2012;Chen et al, 2015; and GIAs (Raie and Tassoulas, 2009;O'Loughlin et al, 2013;Kim and Hossain, 2015;Wei et al, 2015;Liu et al, 2016b). The large deformation Finite Element Methods (FEMs), both the Remeshing and Interpolation Technique with Small Strain.…”

Section: Complex Kinematic Mechanism and Behavior Of Anchors In The Smentioning

confidence: 99%

Offshore Geotechnical Problems in Deepwater Mooring Techniques for Large Floating Structures

Liu¹,

Zhou²,

Zhang³

2018

American Journal of Engineering and Applied Sciences

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An effective, reliable and economic positioning technique is of great necessity for offshore large floating structures. Within all techniques of station keeping, mooring plays a vital role for large floating structures. Clear knowledge of the role and particularities of mooring systems is important to the design, operation and analysis of large floating structures especially in deep waters. The present work aims to discuss the mooring techniques applied to deep waters. Surveys and statistical analysis are performed to highlight the strategic importance of deepwater mooring techniques. An engineering case is introduced to demonstrate the specialities of the deepwater mooring research. Different types of anchors which are applicable to deep waters are reviewed with emphasis due to the key role of anchors in the mooring system. Offshore geotechnical problems in deepwater mooring techniques as well as research advances are summarized for the ongoing and future studies.

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“…To improve the knowledge about and understanding of anchor penetration and move ment, dragging tests and anchor dropping experiments were performed [4]. According to [5], [6] and [7], the retention capacity and kinematic mechanisms of drag anchors have been well studied experimentally and analytically. Only a few numerical approaches exist which investigate the anchor movement and its consequences.…”

Section: Previous Research Workmentioning

confidence: 99%

Impact on submarine cables due to ship anchor – soil interaction

Osthoff

Heins

2017

Geotechnik

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Anchors are one of the main reasons for submarine cable damage. A certain permanent burial depth is necessary if the risk of submarine cable failure due to anchor penetration into the soil is to be reduced. Two factors are important for the burial depth: the penetration depth of the anchor in the first place and the influencing depth of the anchor movement. This means that cables can be damaged either by an anchor penetrating into the subsoil and coming into direct contact with the cable or by an anchor moving above the cable but inducing a pressure load on the cable. To investigate the influence of anchor movement on a submarine cable and to derive the possible damage mechanisms, numerical simulations were conducted using the Coupled Eulerian‐Lagrangian (CEL) method.

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The kinematic behaviour of drag anchors in sand

Cited by 39 publications

References 0 publications

Reliability assessment of drag embedment anchors in sand and the effect of idealized anchor geometry

Reliability assessment of drag embedment anchors in sand and the effect of idealized anchor geometry

Offshore Geotechnical Problems in Deepwater Mooring Techniques for Large Floating Structures

Impact on submarine cables due to ship anchor – soil interaction

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