The connector of the polyethylene composite geomembrane is welded, and the tensile strength of the connector is much smaller than that of the composite base material, which cannot meet the need to apply the technical standard of not less than 80% of the base material strength in the technical specifications. First, the reason is that the polyethylene film is heated and melted during the whole process of welding, and it bonds under pressure, and the film becomes thinner or even aging, resulting in a reduction in the tensile strength of the film welded joint; on the other hand, in order to meet When welding is required, the film at the joint is separated from the non-woven fabric. After the joint is welded and stitched, the film is tight and loose during the whole stretching process. When the film deforms differently, the tensile strength is low. Low-strength joints become the weak link in the composite geomembrane anti-seepage system. When composite geomembrane is used for seepage prevention, weak joints will reduce its overall structural reinforcement effect on the soil. On the other hand, when the joints are inclined, they are easily damaged by water pressure or soil deformation, reducing their overall anti-seepage Level.
