The Influence of Geometry and Size on the Static Vertical Pullout Capacity of Marine Anchors Embedded in Very Loose, Saturated Sand

摘要

The design of several types of anchorages and mooring systems for marine installations is predicated upon the accurate calculation of the vertical pullout capacity of those anchorage systems. Involved in the solution of the vertical pullout capacity of embedment anchorages are the engineering properties of the confining soil; the duration of the loading period; and depth, size and shape of the anchor flukes. The purpose of this testing program was to investigate the behavior of anchor flukes of several different geometries and sizes in a very loose, saturated sand. It was desired to determine which, if any, of the flukes provided the maximum vertical pullout capacity under static loading conditions, and whether any size effects upon pullout capacity existed. Flat and skewed flukes of square, circular and rectangular shape and 55, 110 and 220 square inches in projected area were tested in an outdoor test facility of concrete. Full-section and semi-spacial models were tested in the laboratory for visual observation of the mode of failure. (Author)