Geomembrane is a waterproof and barrier material based on high polymer materials. It is mainly divided into low-density polyethylene (LDPE) geomembrane, high-density polyethylene (HDPE) geomembrane, and EVA geomembrane. The warp knitted composite geomembrane is different from general geomembranes. Its characteristic is that the intersection of longitude and latitude is not curved, and each is in a straight state. Tie the two firmly with braided thread, 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 the tear resistance. When warp knitted composite is used, the warp knitted thread is repeatedly threaded between the fiber layers of warp, weft, and geotextile to weave the three into one. Therefore, the warp knitted composite geomembrane has the characteristics of high tensile strength and low elongation, as well as the waterproof performance of the 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 application of geosynthetic composite materials internationally today.
High tensile strength, low elongation, uniform longitudinal and transverse deformation, high tear resistance, excellent wear resistance, and strong water resistance.. Composite geosynthetic membrane is a geosynthetic anti-seepage 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 the plastic film. The plastic films used for anti-seepage applications at home and abroad mainly include (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 geotextile film is mainly determined by whether the plastic film has lost its anti-seepage and water blocking 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 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-11-2024