The Research On Horizontal Permeability Of Staple Fiber Needle-punched Geotixtile

With the unique 3-D fiber-network structure, staple fibers needlepunched nonwoven geotextiles has excellent filtering and draining function, so it has already became a unique choice in geotextile to play drainage function. However, at present, the research on drainability of staple fibers needlepunched nonwoven geotextiles in our country is so poor. The horizontal permeation coefficient can only indirectly obtained by geotextiles and geotextile-related products determination of water flow capacity in their plane, and the whole time-consuming experiment processes is tediousness. Aims at this actuality, this topic is based on the experiment, mainly discussed the horizontal permeation coefficient of staple fibers needlepunched nonwoven geotextiles from the theory aspects.Based on Darcy Theorem, according to previous research on vertical permeability, the horizontal permeability models of staple fibers needlepunched nonwoven geotextiles are established by using resistance theory model and fractal theory model independently. Then, fitting the experimental data and the horizontal permeation coefficient by the models to test the feasibility of the horizontal permeability models and the fitting effect. In the research, a longitudinal equilateral triangle model of polyester staple fiber needle-punched geotixtile is established to accurately describe the pore size in longitudinal section of geotextiles. This point has some innovativeness.The research results indicate that: in certain other conditions, the horizontal permeation coefficient of staple fibers needlepunched nonwoven geotextiles increases with the increase of the mass per unit area, with the decrease of the normal pressure. As the normal pressure advanced gradually, the variation range of horizontal permeation coefficient decreases. Both the resistance theory model and the fractal theory model are feasible to simulate the the horizontal permeation coefficient of staple fibers needlepunched nonwoven geotextiles, although the data is bigger than the experimental data, the simulating effect of the fractal theory model is relative better. The above-mentioned conclusions has the leading meaning to the actual application of staple fibers needlepunched nonwoven geotextiles.