The performance of drag anchor and chain systems in cohesive soil

Neubecker, S.R.; Randolph, Mark

doi:10.1080/10641199609388305

Cited by 59 publications

(31 citation statements)

References 4 publications

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“…The anchor's location is updated and the procedure repeated until the anchor has stabilised to a position of no further rotation. This procedure follows a similar process established by Randolph (1996) andO'Neill et al (2003) for evaluating the kinematic response of drag anchors.…”

Section: Plasticity Approachmentioning

confidence: 99%

“…Typical loading angles, Ł 0 , are around 35-458 from the horizontal in practice. The chain profile, and the difference between Ł a and Ł 0 , depends on the current anchor depth and the magnitude of the pulling force relative to the soil resistance (Neubecker & Randolph, 1995, 1996. Since the chain is initially vertical, most studies of anchor keying have focused on a purely vertical force applied at the anchor padeye.…”

Section: Introductionmentioning

confidence: 99%

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A plasticity model to assess the keying of plate anchors

Cassidy¹,

Gaudin²,

Randolph³

et al. 2012

Géotechnique

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Suction-embedded plate anchors (SEPLAs) have been developed to answer the growing need for anchors to withstand significant vertical loading. The concept combines the advantage of suction caissons (known penetration depth and location) and 'drag-embedded' plate anchors (efficiency and low cost). The main issue associated with SEPLAs relates to the keying process, as the anchor is first loaded, and the associated loss of embedment and reduction in capacity. The paper presents a plasticity model developed to predict the trajectory and load development during anchor keying, and up to peak load. Rigid plasticity is assumed, allowing the kinematics of the anchor to be determined from a yield surface and associated plastic potential. The trajectory and performance of a typical SEPLA are predicted using the model, and are compared with results from centrifuge tests and large-deformation finite-element analysis. The anchor loss of embedment ranged from ,0 . 2 to 1 . 5 times the anchor height for loading inclinations between 408 and 908 from the horizontal. The model was used further to calculate the anchor loss of embedment and capacity for varying padeye offsets. Results indicated that the loss of embedment could be reduced significantly by increasing the offset, but at the detriment of the ultimate anchor capacity.

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Section: Plasticity Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A plasticity model to assess the keying of plate anchors

Cassidy¹,

Gaudin²,

Randolph³

et al. 2012

Géotechnique

View full text Add to dashboard Cite

show abstract

“…Quantifying the ultimate embedment depth is important for anchor design as it essentially determines the holding capacity. With this aim a significant body of work has addressed modelling the anchor installation process analytically (Neubecker & Randolph, 1996;O'Neill et al, 2003;Murff et al, 2005;Aubeny & Chi, 2010.…”

Section: Introductionmentioning

confidence: 99%

“…Assuming a constant anchor chain pulling angle, they showed that optimal choice of η ¼ e p =e n causes the anchor to dive, increasing embedment. However, in practice the chain pulling angle at the padeye will gradually increase as the anchor embeds, due to the inverse catenary geometry of the chain through the soil (Neubecker & Randolph, 1995, 1996Murff et al, 2005). Consequently, the vertical component of pulling load will increase and the anchor will not dive indefinitely, but will reach an equilibrium ultimate embedment depth.…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for ultimate embedment depth and potential holding capacity of plate anchors

2015

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This paper proposes an analytical approach to evaluate the ultimate embedment depth and holding capacity that plate anchors can potentially achieve. Based on a plasticity model for anchor-soil interaction and compatible chain solution, detailed derivations are presented that allow the main dimensionless groups of input parameters to be identified. For typical cases where the weight of the anchor is negligible relative to its holding capacity, explicit expressions are provided in non-dimensional form for ultimate embedment and anchor capacity. A thorough parametric sensitivity study highlights the major factors affecting these quantities. Two practical examples are considered that demonstrate the proposed analytical approach for different types of anchors, in one case revealing significant scope for improved design of plate anchors in order to optimise performance.

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“…Although a number of analytical and numerical studies more or less relevant to the above problems can be found in the literature [1][2][3][4][5][6][7][8][9], the relative experimental investigations, through 1 g lab tests or centrifuge programs, are limited and can be summarized as follows.…”

Section: Introductionmentioning

confidence: 99%