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The composite geomembrane is composed of one layer of geotextile and one layer of hdpe geomembrane or two layers of hdpe geomembrane. The geomembrane is a layer of hdpe film. What is the difference between the two? Geotextiles only need thermal fusion materials, and composite geotextiles need stitched geotextiles.

The villagers built a small earth-rock dam on the river. After years of use and operation, many problems and defects have appeared. After investigation, a leak was found at the top of the dam.

The raw materials used for composite geomembrane should not only take into account the physical and chemical performance indicators specified in the use environment, but also pay special attention to the production cost. In terms of performance indicators, the following aspects are mainly considered:

The anti-seepage geomembrane is polyvinyl chloride and polyethylene, which are soft raw materials of polymer chemistry.

The purpose of geomembrane is to use its anti-permeability effect. Geomembrane should be impermeable to the molecular structure and manufacturing process. However, due to the unevenness and defects in manufacturing, the commonly used geomembrane must not leak. It's just that it is relatively difficult to permeate and what is more important is whether the geomembrane can maintain its anti-seepage performance under the action of long-term water head when it contacts the actual soil (or other materials). Due to the uneven contact surface, rough soil particles, large local deformation of the soil, etc., the geomembrane may be broken or torn under the action of high water head, and its anti-seepage performance will be lost or weakened. Therefore, corresponding anti-seepage tests are also required.

The significance of the high-density hdpe geomembrane to resist environmental stress cracking is to use elastic basic theory and viscoelastic model to clearly propose a test standard for temperature stress and temperature stress relaxation.