抄録
The ground destabilization that results from internal erosion involving soil particle effluxes can result in piping displacements and seepage-related levee failures. While such erosion can be evaluated by using Kenney’s Filter Index and particle size distributions, the relationship between ground destabilization and soil particle outflow has not yet been elucidated. In this study, we intend to clarify this internal erosion mechanism through two experiments. The primary conclusions of these experiments are as follows: (1) Since differences in soil particle distribution cause the efflux of soil particles and result in hydraulic conductivity changes, seepage-related soil failures that involve unstable soil particle distribution cannot be evaluated by Terzaghi’s critical hydraulic gradient. (2) Soil porosity changes that occur during the efflux of soil particles can be measured using a dielectric constant-type soil water meter.
