Investigation of filament distribution at geotextile/geomembrane interfaces Available to Purchase

This paper presents results from a study that examined the filament distributions at needle-punched nonwoven (NPNW) geotextile/HDPE geomembrane interfaces. An advanced image analysis technique was used to observe the evolution of the filament microstructure under different boundary conditions including normal force loading and unloading, as well as shear force loading to residual conditions. The different phases within the geosynthetic interface zone were detected from images captured using high-resolution optical microscopy. The changes in geotextile inner structure were statistically quantified in terms of filament nearest neighbour distance distribution and local void ratio distribution. The frequency of geotextile features within 10 μm of the interface increased by 73% as the normal stress increased from 10 to 300 kPa. The filament concentration at filament-texture interlocking points was quantified in terms of the local void ratio distribution. The study provides insight into the mechanism of geotextile microstructure evolution under different boundary conditions.