Geomembrane mechanism

Its main mechanism is to isolate the leakage channel of the earth dam with the impermeability of plastic film, and to withstand water pressure and adapt to dam deformation with its large tensile strength and elongation; And non-woven fabric is also a polymer short fiber chemical material that is formed by needle punching or hot bonding, with high tensile strength and elongation. When combined with plastic film, it not only increases the tensile strength and puncture resistance of plastic film, but also increases the friction coefficient of the contact surface due to the rough surface of non-woven fabric, which is conducive to the stability of composite geomembrane and protective layer. At the same time, they have good corrosion resistance to bacteria and chemical reactions, are not afraid of acid, alkali, and salt erosion, and have a long service life when used in a dark environment.
Age
In view of the fact that some field observation results of composite geomembrane synthetic materials have certain anti-aging ability in engineering application, some documents of some countries have made relatively lenient provisions on their service life, such as the former Soviet Union BCH07-74 Instructions for the Application of Polyethylene Anti seepage Structure in Earth rock Dams, which stipulates that polyethylene geomembrane can be used for buildings with a service life of no more than 50 years. The conclusion in the article "Long term properties of polypropylene composite geomembrane geosynthetic materials" published by the Austrian company Linz states: "Over 15 years of on-site application experience with polypropylene have shown high chemical and biological stability; the maximum damage to the fabric is during construction; there is no significant change after laying;... stability can be expected to exceed 100 years