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1. SeparationThe separation function of geotextile is majorly used in the construction of roads. Geotextile prevents the intermixing of two adjacent soils. For example, by separating fine subgrade soil from the aggregates of the base course, the geotextile preserves the drainage and the strength characteristics of the aggregate material.Some of the applicable areas are:Between subgrade and stone base in unpaved and paved roads and airfields.Between subgrade in railroads.Between landfills and stone base courses.Between geomembranes and sand drainage layers.2. FiltrationThe equilibrium of geotextile-to-soil system that allows for adequate liquid flow with limited soil loss across the plane of the geotextile. Porosity and permeability are the major properties of geotextiles which involve infiltration action.A common application illustrating the filtration function is the use of a geotextile in a pavement edge drain, as shown in the figure above.3. ReinforcementIntroduction of geotextile in the soil increases the tensile strength of the soil the same amount steel does in concrete. The strength gain in soil due to the introduction of geotextile is by the following 3 mechanisms :Lateral restraint through interfacial friction between geotextile and soil/aggregate.Forcing the potential bearing surface failure plane to develop an alternate higher shear strength surface.Membrane type of support of the wheel loads.4. SealingA layer of non-woven geotextile is impregnated in between existing and new asphalt layers. The geotextile absorbs asphalt to become a waterproofing membrane minimising vertical flow of water into the pavement structure.Filamentgeotextile is apolyester filament needle punched non-woven geotextile, without chemical additives and without heat treatment,it is an environmentally friendly building material with good mechanical function, good waterpermeability, corrosion resistance, anti-aging.It has the function of isolation,anti-filltratin,drainage,protection,stabilization,reinforcement, etc. It can adapt to uneven base layers,can resist the damage of external force during construction, has small creep, and can still maintainthe originalfunction underlong-termload. In the isolation layer between artificia rockfill or material field and foundation.isolation between different permafrost lavers. back fltra -tion and reinforcementThe scope of geotextile in the engineering field is very vast. The application of geotextile is given under the heading of the nature of work.1. Road WorkGeotextiles are widely used in the construction of the road. It reinforces the soil by adding tensile strength to it. It is used as a rapid de-watering layer in the roadbed, the geotextiles need to preserve its permeability without losing its separating functions.2. Railway WorksThe woven fabrics or the non-woven ones are used to separate the soil from the sub-soil without impeding the groundwater circulation where the ground is unstable. Enveloping individual layers with fabric prevents the material from wandering off sideways due to shocks and vibrations from running trains.3. AgricultureIt is used for mud control. For the improvement of muddy paths and trails those used by cattle or light traffic, nonwoven fabrics are used and are folded by overlapping to include the pipe or a mass of grit.4. DrainageThe use of geotextiles to filter the soil and a more or less single size granular material to transport water is increasingly seen as a technically and commercially viable alternative to the conventional systems. Geotextiles perform the filtering mechanism for drainages in earth dams, in roads and highways, in reservoirs, behind retaining walls, deep drainage trenches, and agriculture.5. River, Canals and Coastal WorksGeotextiles protect river banks from erosion due to currents or lapping. When used in conjunction with natural or artificial enrockments, they act as a filter.