Geomembrane is a waterproof and barrier material based on high polymer. Mainly divided into low density polyethylene (LDPE) geomembranes, high-density polyethylene (HDPE) geomembranes, and EVA geomembranes. Warp knitted composite geomembrane is different from general geomembrane. Its characteristic is that the intersection of longitude and latitude is not curved, and each is in a straight state. Bundle the two firmly with braided wire, which can be evenly synchronized, withstand external forces, distribute stress, and when the applied external force tears the material, the yarn will gather along the initial crack, increasing tear resistance. When warp knitted composite is used, warp knitted threads are repeatedly threaded between the fiber layers of warp, weft, and geotextile, making the three interwoven into one. Therefore, warp knitted composite geomembrane not only has the characteristics of high tensile strength and low elongation, but also has the waterproof performance of geomembrane. Therefore, warp knitted composite geomembrane is a type of anti-seepage material that has the functions of reinforcement, isolation, and protection. It is a high-level applied geosynthetic material in the international community today.
High tensile strength, low elongation, uniform longitudinal and transverse deformation, high tear resistance, excellent wear resistance, and strong water resistance.. 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. The plastic films used for seepage prevention at home and abroad mainly include (PVC) polyethylene (PE) and 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.
Post time: Jun-16-2023