Results of Research on Bulging Prisms of Vertically Loaded Floating Ground Anchors

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630*378

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Abstract

Reliable and trouble-free operation of bearings depends not only on their design, but also on the method of calculating their holding power. The existing techniques for determining carrying capacity are based on a predetermined form of ground prism that is formed before the anchor bearing at its displacement. It is therefore very important to determine the exact shape of slip lines. At present, methods based on electronic image processing are finding ever-widening application. Particle Image Velocimetry (PIV) allows us to process images produced by video filming and photography. The method of determining the form of soil slip lines using MatPIV was tested under the guidance of A.N. Vykharev in the laboratory of the Department of Waterborne Timber Traffic and Hydraulics (NArFU) in the groundwater basin with a transparent side panel. As a result, we established a possibility in principle to record forms of slip lines using this method and developed a computer program in MatLab, which determines the points of soil displacement for each row of elementary areas and constructs experimental slip lines passing through the edges of the anchor. Using the obtained relationships we constructed theoretical slip lines and carried out a comparative analysis. The experiments were performed according to a predetermined plan. The relative depth of the anchor (the ratio of depth of the anchor to diameter) was the varying factor. Varying levels of relative depth: 2, 4 and 6. In each series we conducted 6 model-based experiments. Calculation of theoretical slip lines was done using the method of quasipotential modelling of the mechanical characteristics of the anchor operating in the soil mass. The theoretical slip lines satisfactorily coincide with the experimental ones. The correlation coefficient is 0.912, the mean deviation being 10.07 %, which is a sufficient correspondence for soil mechanics. The use of PIV allows us to standardize and automate the process of recording the forms of slip lines.

Authors

A.L. Popov Northern (Arctic) Federal University named after M.V. Lomonosov

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov

Keywords

waterborne timber traffic, anchor, slip lines, PIV method, quasipotential model.