Investigation of excess water-pressure under the asphalt facing of sand-cored dykes

Paper for 9the Conference of the International Association of Hydro-Environment Engineering and Research, Belgrade, 1961

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The excess pressures anticipated underneath the asphalt facing of a number of sea dykes were determined with the aid of plate-shaped electrical conductors and alternating current. As these excess pressures are influenced by factors varying from place to place in the prototype, a series of tests were carried out in which one or more of these factors were varied. With the help of some examples the following subjects will be dealt with: - the influence of permeability and its inhomogenity; - the influence of various forms of drainage in the toes of the dykes; - the consequences of air being imprisoned between the facing and the surface of the ground water.