Geotextile is used as a protective layer for geomembrane to protect the anti-seepage layer from damage. In order to reduce ultraviolet radiation and increase anti-aging performance, it is better to use the embedding method for laying.

1. During construction, first use sand or clay with a smaller diameter to level the base surface, and then lay the geomembrane. The geomembrane should not be stretched too tight, and the parts buried in the soil at both ends are corrugated. Finally, a 10cm transition layer of fine sand or clay is laid on the laid geomembrane. 20-30cm blocks (or prefabricated concrete blocks) are laid as an anti-impact protective layer. During construction, efforts should be made to avoid stones hitting the geomembrane directly, and it is better to construct the protective layer while laying the membrane. The composite geomembrane should be connected to the surrounding structures with expansion bolts and steel plate strips for anchoring, and the connection parts should be coated with emulsified asphalt (2mm thick) for bonding to prevent leakage at that location.
2. The joint treatment of the composite geomembrane is a key process, which directly affects the anti-seepage effect. The general joint methods are: ① Overlap: The overlap width should be greater than 15cm; ② Hot welding: Suitable for slightly thicker geomembrane substrates, the weld overlap width should not be less than 5CM. (Gluing is not recommended, long-term water immersion is prone to debonding, and the anti-seepage effect is poor.)
3. According to years of practice, the thickness of the geomembrane should not be less than 0.25mm. Too thin may produce pores and is easily damaged during construction, reducing the anti-seepage effect. In the construction of geomembranes, special attention should be paid to ensure that the laying is not too tight, wrinkles should not be formed, and the splicing should be firm. Construction should be strictly carried out according to technical specifications, and the five quality control procedures of preparation, laying, splicing, inspection and backfilling should be well controlled.