Behaviour of geotextile filters in contact with internally unstable cohesionless soils

In this study, the compatibility of internally unstable soils with two nonwoven geotextile filters was analysed by means of a method proposed by the Authors in a recent research. The method is based on a geometrical, experimental and micro-structural approach that considers the geotextile pore size distribution and its filtration opening size, the soil grain size distribution and its critical diameter of suffusion, the results of long-term filtration tests and the scanning electron microscope images of geotextile microstructure. The method application allowed the Authors to better evaluate the soil/geotextile filter compatibility under critical/severe conditions.