Composite Geomembrane Construction

Composite geomembrane is a composite geomembrane formed by applying geotextile to one or both sides of the membrane. Its forms include one cloth one film, two cloth one film, two film one cloth, etc.
The geotextile serves as the protective layer of the geomembrane, preventing damage to the impermeable layer. In order to reduce the ultraviolet radiation and increase the anti-aging performance, it is best to use the embedding method for laying.
During construction, first use sand or clay with a smaller diameter to level the foundation surface, and then lay the geomembrane. Do not tension the geomembrane too tightly. The parts buried in the soil at both ends are corrugated. Finally, use fine sand or clay to lay a transition layer of about 10cm on the laid geomembrane. Build 20-30cm block stones (or precast concrete blocks) as a protective layer against erosion. During construction, efforts should be made to avoid stones directly hitting the geomembrane, and it is best to construct a protective layer while laying the membrane. The connection between the composite geotextile membrane and surrounding structures should be anchored with expansion bolts and steel plates, and the connection area should be coated with emulsified asphalt (2mm thick) for bonding to prevent leakage.
The joint treatment of composite geomembrane is a key process that directly affects the anti-seepage effect. The general joint methods include: ① overlap: the overlap width should be greater than 15cm; ② Hot welding: suitable for slightly thick geomembrane substrate, with a weld overlap width of no less than 5CM (Adhesive bonding is not recommended, as prolonged immersion in water can easily open the adhesive and result in poor anti-seepage effect.)
Based on years of practice, it has been proven that the thickness of the geomembrane is not less than 0.25mm. If it is too thin, it may cause pores and may be damaged during construction, thereby reducing the anti-seepage effect. During the construction of geomembrane, special attention should be paid to ensuring that the laying should not be too tight, wrinkling is not allowed, and the splicing should be firm. We must strictly follow the technical specifications for construction, and ensure the five quality standards of preparation, laying, splicing, inspection, and backfilling.