Author(s): K. A. Mazurek; A. R. Gheisi
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Keywords: No Keywords
Abstract: Determining the erodibility of clay-rich or “cohesive soils” is a difficult task. A number of devices have been developed to measure erosion resistance in-situ, however none has become widely accepted. This paper examines the performance of a technique for erodibility assessment by Hanson and Cook (2004) that uses a vertical turbulent circular impinging jet to create scour in the soil. The method is used to assess the range of critical shear stress predicted for one clay-rich soil from several experiments in scour by this type of jet carried out under range of hydraulic conditions. It was found there was large variability in the predicted critical shear stress (50-157 Pa). Some of this variability appears to be due to differences in jet decay in scour holes of different geometry. A modified equation for the decay of the maximum velocity of the jet in the soil hole was developed in hopes of improving the predictions of critical shear stress from scour measurements by an impinging jet.
Year: 2009