Characteristics of composite geomembrane

The anti-seepage performance of a geotechnical anti-seepage material composed of plastic film as the anti-seepage substrate and non-woven fabric mainly depends on the anti-seepage performance of the plastic film. The plastic films used for anti-seepage at home and abroad mainly include polyvinyl chloride (PVC), polyethylene (PE), and ethylene/vinyl acetate copolymer (EVA). They are polymer chemical flexible materials with small specific gravity, strong extensibility, high adaptability to deformation, corrosion resistance, low temperature resistance, and good frost resistance.
The service life of composite geomembrane is mainly determined by whether the plastic film has lost its anti-seepage and water separation function. According to the national standards of the Soviet Union, polyethylene film with a thickness of 0.2m and a stabilizer used in hydraulic engineering can work for up to 40-50 years under clear water conditions and 30-40 years under sewage conditions. Therefore, the service life of the composite geomembrane is sufficient to meet the anti-seepage requirements of the dam.