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These are continuous or short fibre geosynthetic materials, mainly prepared in the form of woven or un-woven sheets, for their use as an auxiliary element between the infrastructure's platform layers. These materials have the following mechanical and hydraulic functions: stopping the different composition layers' materials from mixing, reinforcement due to their tractive resistance, a waterproof membrane protection against shear failure, a support for coverings, filtration allowing water to pass through them but not fines and drainage when they are arranged in very thick layers. They are used amongst other applications for railway work as a sub-base substitute or complement.