News

Composite geomembrane is widely used in canal seepage prevention engineering. In recent years, the extensive use and effectiveness of geotechnical decomposition data in civil engineering, especially in flood control and emergency rescue projects, has attracted high attention from lenient engineering technicians. Regarding the utilization techniques of geotechnical decomposition data, the state has proposed standardized techniques for seepage prevention, filtration, drainage, reinforcement, and protection, greatly accelerating the promotion and utilization of new data. This information has been widely used in canal seepage prevention projects in irrigation areas. Based on the theory of joint construction, this paper discusses the utilization techniques of composite geomembrane.

Composite geomembrane is a composite geomembrane formed by heating one or both sides of the membrane in a far infrared oven, pressing the geotextile and geomembrane together through a guide roller. With the progress of labor technology, there is another process of casting composite geomembrane. The situation includes one cloth and one film, two cloth and one film, and two film and one cloth.
As the protective layer of the geomembrane, the geotextile prevents the protective and impermeable layer from being damaged. In order to reduce ultraviolet radiation and increase performance, it is advisable to adopt the embedding method for laying.
During construction, first use sand or clay with a smaller material diameter to level the foundation surface, and then lay the geomembrane. The geomembrane should not be stretched too tightly, with both ends buried in the soil in a corrugated shape. Finally, use fine sand or clay to lay a 10cm transition layer on the paved geomembrane. Build 20-30cm block stones (or precast concrete blocks) as a protective layer against erosion. During construction, efforts should be made to prevent stones from indirectly hitting the geomembrane, preferably stopping the construction of the shield layer while laying the membrane. The connection between the composite geomembrane and the surrounding structures should be anchored by shrinkage bolts and steel plate beads, and the joint should be coated with emulsified asphalt (2mm thick) for bonding to prevent leakage.
Construction incident
(1) Buried type shall be adopted for utilization: the covering thickness shall not be less than 30cm.
(2) The renovated anti-seepage system should consist of cushion, anti-seepage layer, transition layer, and shield layer.
(3) The soil should be soft to prevent uneven settlement and cracks, and the turf and tree roots within the impervious range should be eliminated. Lay sand or clay with small particle size as a protective layer on the surface against the membrane.
(4) When laying, the geomembrane should not be pulled too tightly. It is better to embed both ends in the soil in a corrugated shape. In addition, when anchoring with rigid data, a certain amount of expansion and contraction should be reserved.
(5) During construction, it is necessary to prevent stones and heavy objects from indirectly hitting the geomembrane, construct while laying the membrane, and cover the protective layer.