Composite geomembrane is a geomembrane material composed of plastic film as the anti-seepage substrate and non-woven fabric. Its anti-seepage performance mainly depends on the anti-seepage performance of plastic film. Plastic films used for seepage prevention at home and abroad mainly include polyvinyl chloride (PVC), polyethylene (PE), ethylene/vinyl acetate copolymer (EVA), which are flexible materials of polymer chemistry, 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.
Zhaojiadian Village, Jiaoxi Sub District Office, Jiaozhou City, Qingdao City, Shandong Province ,China
