Stability of Multi-layered System of Encapsulated Soils by Geotextiles

Abstract

An encapsulated soil by a geotextile such as a soil-bag increases its strength due to the confining effect of deformation. In order to investigate the mechanical properties of its multi-layered system, several laboratory model tests were carried out in terms of compressibility, shear resistance, slope stability, and friction of geotextile-interfaces. As the results, it was found that the compressibility of fine gravel was smaller than that of sand. A higher compressibility was observed in loose, dry and cubic packing conditions for both sand and fine gravel. The shear strength has a relation to the density of soil but not the soil type. The optimum frictional stability of the multi-layerd system was obtained at 60 to 80% of the relative density of a soil-bag.