... filtration layer of the dykes, river canal, seacoast, concrete slope, retaining walls. At the same time of preventing the clay granule from ... the airdrome and parking lot and the groundsill, different dam materials. It isolates the soil and the gravel of two ... , railway, soil-stone dam, breakwater, airport, backfill soil of retaining wall, slope protection, etc in which distributes the earth stress ...