Piping in loose sands: the importance of geometrical fixity of grainsReportar como inadecuado




Piping in loose sands: the importance of geometrical fixity of grains - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

(2012)2nd European conference on physical modelling in geotechnics, Proceedings.p.1-10 Mark abstract Piping is one of the possible failure mechanism for dams and levees with a sandy foundation. Water flowing through the foundation causes the onset of grain transport, due to which shallow pipes are formed at the interface of the sandy layer and an impermeable blanket layer. In the past, the mechanism has been investigated predominantly in densely packed sands, in which the process was observed to start at the downstream side (backward erosion). Recently performed experiments in loose sand (van Beek et al. 2009) showed a different failure mechanism (forward erosion). In this article additional experiments of piping in loose sands are described for investigating the relevance of the forward process for practice. In these experiments the type of process was found to be dependent on the presence of shear resistance between sand box cover and top sand grains, that causes grains to be fixed geometrically. Without this shear resistance the process was found to be forward, whereas with this shear resistance the process was found to be backward oriented. The change in degree of fixity and relative density as a result of loading is investigated with electrical density measurements. The experiments show that the forward process is not relevant for levees in practice, in which the cohesive blanket layer causes the sand grains to be fixed properly.

Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-2097875



Autor: Vera Van Beek, Adam Bezuijen and FM Schenkeveld

Fuente: https://biblio.ugent.be/publication/2097875



DESCARGAR PDF




Documentos relacionados