Installation and Pull-Out Capacities of Drag-In Plate Anchors

Abstract

The trend towards taut-wire mooring systems, instead of catenary chains, to anchor floating facilities for offshore exploration requires high-capacity anchoring systems capable of withstanding vertical loading components. Conventional drag anchors have very limited vertical capacity, and this has led to the development of alternative drag-in plate anchors, or vertically loaded anchors (VLAs). VLAs are installed in a similar way to conventional drag anchors, but they are ultimately loaded normal to their plate surface, and thus act like embedded plate anchors. A critical issue in the overall mooring system design is the ratio of the pull-out load to the anchor installation load, and this is termed the performance ratio. The performance of a model VLA was modelled in a geotechnical centrifuge, with particular attention to the performance ratios. Whilst the performance ratios obtained were much lower than expected, the testing proved that VLAs provide a simple and inexpensive alternative to other anchoring systems.

Experimental investigation on the penetration mechanism and kinematic behavior of drag anchors

“…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.…”

Evaluation of Behaviors on Mooring Line Embedded in Sand Using Centrifuge Test

“…. 지력에 영향을 미친다 (Neubecker and Randolph, 1996;Zdravkovic et al, 1998;Elkhatib et al, 2002). 하는 하중과 그 경사각이 된다 (Degenkamp and Dutta, 1989;Dutta et al, 1989).…”