... filtration, protection, support, drainage, reinforcement APPLICATIONS OF GEOTEXTILES1 FiltrationThe filtration layer of the dykes, river canal, seacoast, concrete slope, ... the gas pass through freely.2 Separation:The isolation of the railway dregs and the roadbed, roadbed and ... railway, soil-stone dam, breakwater, airport, backfill soil of retaining wall, slope protection, etc in which distributes the ...