... punched non woven geotextile1.UsageUsed in the area of highway, railway, dam, lam fencing for filtration, separation drainage and protection ... gas pass through freely.B. Separation:The isolation of the railway dregs and the roadbed, roadbed and the soft base, ... from the groundsill or other buildings. C. Adding muscleThe highway, railway, soil-stone dam, breakwater, airport, backfill soil of retaining ...