ABSTRACT
The vertical permeability coefficient is an important hydraulic characteristic index of needle-punched nonwoven geotextiles. A theoretical model has been proposed to predict the vertical permeability coefficient of nonwoven geotextiles, considering the fiber orientation distribution characteristics. The permeability coefficient and parameters of four needle-punched nonwoven geotextiles were obtained from the literature and image analysis. By comparing the predicted results of the permeability model with the experimental results, it is confirmed that the permeability model proposed in this paper was validated with thicker nonwoven geotextiles.
