Theoretical model on mass of soil particles passing through two-layered

Abstract

A two-layered nonwoven geotextile, associated with one layer of fine fibres having a thickness selected to provide optimal filtration characteristics and another layer of coarse fibres to provide the required mechanical properties, has been developed to study its theoretical filtration performance. Based on the theoretical filtration of single layer nonwoven geotextile, a mathematical model on mass of soil passing through two-layered nonwoven geotextile is established. The model is validated by slurry test using a self-designed apparatus. The experimental results obtained for five different specimens are compared with the theoretical solution, and it is found that the present model predicts to an accuracy of about 93.2﹪ for needle-punched two-layered nonwoven geotextiles.