Composite membrane construction site-复合膜施工现场

The application of composite geomembrane in canal anti-seepage engineering: In recent years, the extensive application and effectiveness of geosynthetics in civil engineering, especially in flood control and emergency engineering, have attracted high attention from engineering and technical personnel. For the application technology of geosynthetics, the country has put forward standardized technical requirements from aspects such as anti-seepage, filtration, drainage, reinforcement, and protection, greatly accelerating the promotion and application of new materials. This material has been widely used in canal anti-seepage engineering in irrigation areas. Based on construction practice, this article discusses the application technology of composite geomembrane.

1. Performance of composite geomembrane

Composite geomembrane (composite anti-seepage membrane) is divided into one cloth one membrane and two cloth one membrane, with a width of 4-6 meters and a weight of 200-1500g/square meter. It has high physical and mechanical performance indicators such as tensile strength, tear resistance, and bursting resistance. The product has high strength, good elongation performance, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance, and anti-seepage performance. It can meet the needs of civil engineering such as anti-seepage, isolation, reinforcement, crack prevention and reinforcement in water conservancy, municipal engineering, construction, transportation, subway, tunnel, and engineering construction. Due to the use of polymer materials and the addition of anti-aging agents in the production process, it can be used in unconventional temperature environments. Commonly used for anti-seepage treatment of embankments, drainage ditches, and anti pollution treatment of waste disposal sites.

2. 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.