%0 Journal Article %A K. Vandenboer and L. Dolphen and A. Bezuijen %D 2017 %J International Journal of Geotechnical and Geological Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 129, 2017 %T Backward Erosion Piping through Vertically Layered Sands %U https://publications.waset.org/pdf/10007839 %V 129 %X Backward erosion piping is an important failure mechanism for water-retaining structures, a phenomenon that results in the formation of shallow pipes at the interface of a sandy or silty foundation and a cohesive cover layer. This paper studies the effect of two soil types on backward erosion piping; both in case of a homogeneous sand layer, and in a vertically layered sand sample, where the pipe is forced to subsequently grow through the different layers. Two configurations with vertical sand layers are tested; they both result in wider pipes and higher critical gradients, thereby making this an interesting topic in research on measures to prevent backward erosion piping failures. %P 766 - 769