What is the role of geomembrane?

Release time:

2023-07-20

Corrosion resistance, low temperature resistance, good cold resistance. The main mechanism is that the imperviousness of the plastic film intercepts the leakage channel of the earth dam, withstands the water pressure with greater tensile strength and elongation, and adapts to the deformation of the dam. Non-woven fabrics are also high-molecular staple fiber chemicals, which have high tensile strength and ductility through impregnation or thermal viscosity. Combining with plastic films not only increases the tensile strength and puncture resistance of plastic films, but also due to non-woven The surface of the cloth is rough, which increases the friction coefficient of the contact surface and contributes to the stability of the composite geomembrane and the protective layer. At the same time, they are highly corrosive to bacteria and chemicals, and are not afraid of acid, alkali, and salt erosion.

The anti-seepage film is made of high-density polyethylene virgin resin, which is made of co-extrusion technology. It has molecular density and low liquid permeability. It has an anti-seepage effect that cannot be compared with general waterproof materials, and the anti-seepage effect is good.

The geomembrane manufacturer said that the service life of the composite geomembrane mainly depends on whether the plastic film has lost its penetration and waterproof effect. According to the Soviet national standard, the polyethylene film with a thickness of 0.2m and a stabilizer used for hydraulic engineering can be used under clear water conditions. The working life can reach 40~50 years, and the working life under sewage conditions is 30~40 years. Therefore, the service life of the composite geomembrane is sufficient to meet the anti-seepage requirements of the dam.

Determination of the scope of film laying

The Zhoudu Reservoir Dam was originally a deep wall dam, but with the collapse of the dam, the upper part of the deep wall was broken. In order to solve the problem of anti-seepage at the upper part, the original anti-seepage inclined wall was added. According to the safety demonstration and analysis of the Zhoutou Reservoir dam, in order to solve the leakage of weak surface and dam foundation leakage caused by multiple landslides of the dam, curtain grouting on the bedrock surface, grouting on the contact surface, Throw wells and fill curtains, GOSFREY permeable board walls and other permeable bodies. The upper inclined wall part is covered with composite geomembrane for infiltration, and the lower part coincides with the vertical anti-seepage wall, rising to a height of 358.0 meters (0.97 meters above the flood level inspection).

Type selection of composite geomembrane

Geomembrane manufacturers pointed out that there are currently many factories producing geomembrane in China, and the product specifications are also varied. One cloth and one film, one cloth and two films, two cloth and one film, two cloth and two films, multiple cloth and multiple films, etc. The models are 200g/m2~1000g/m2, etc. Users can make requirements according to their actual conditions, and geomembrane manufacturers can produce them separately according to requirements.