Investigation on strength degradation of sandy soil subjected to concentrated particle erosion
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There is increasing concern regarding local concentrated erosion scenarios such as piping and underground cavities due to their catastrophic consequences. In this study, local concentrated erosion was reproduced by placing shaped erodible columns within the triaxial specimens during sample preparation. The preplaced erodible columns (made of glucose) were set similar in regard to their volume fraction but different in configurations. Bender element measurements were performed in dry, the erosion on-going, and post erosion states to evaluate the mechanical behavior of the samples subjected to concentrate particle removal. The influence of concentrated particle erosion on the shear wave velocity, shear strength, dilatancy and peak angle of shearing resistance was revealed and discussed. It is generally concluded that the resultant effect on the mechanical behavior of soils is greater when erodible particles are more localized within a limited region, especially for densely packed soils.
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