热博体育官网以塑料薄膜作为防渗基材.热博体育官网防渗性能主要取决于塑料薄膜的防渗性能。 防渗应用的塑料薄膜，主要有聚氯乙烯（PVC）和聚乙烯（PE），它们是一种高分子化学柔性材料，比重较小，延伸性较强，适应变形能力高，耐腐蚀，耐低温，抗冻性能好。防水防渗的聚乙烯热博体育官网主要分为光面热博体育官网，复合热博体育官网，糙面热博体育官网。光面聚乙烯热博体育官网厚度一般有0.5mm 、1.0mm  2.0mm  2.5mm 3.0mm

复合热博体育官网分为一布一膜，二布一膜等。

热博体育官网主要机理是以塑料薄膜的不透水性隔断土坝漏水通道，以热博体育官网较大的抗拉强度和延伸率承受水压和适应坝体变形；同时，热博体育官网对细菌和化学作用有较好的耐侵蚀性，不怕酸、碱、盐类的侵蚀。
热博体育官网的使用年限问题，主要是由塑料薄膜是否失去防渗隔水作用而定，据国家标准规定，水工用的厚度为0.2m的加稳定剂的聚乙烯薄膜，在清水条件下工作年限可达40~50年，在污水条件下工作年限为30~40年。因此复合热博体育官网的使用年限足以满足大坝防渗要求的使用年限。

Geomembrane impermeability is relied on the plastic film which is as impermeable base material. Anti-seepage plastic film mainly includes polyvinyl chloride (PVC) and polyethylene (PE) which is a polymer chemical flexible materials with smaller proportion, stronger extensibility, good adaptability, corrosion resistance, low temperature resistance, frost resistance. Waterproof impermeable polyethylene geomembrane is divided into smooth geomembrane, composite geomembrane, rough geomembrane. Smooth polyethylene geomembrane thickness is generally 0.5mm/ 1.0mm/ 2.0mm/ 2.5mm/ 3.0mm.

Composite geomembrane is divided into a cloth a film, two cloth a film.

The main mechanism of geomembrane plastic film is impermeable to earth dam water leakage channel. Geomembrane has greater tensile strength and elongation to withstand water pressure and adapt to the deformation of the dam. At the same time, the geomembrane has good erosion resistance by bacterial and chemical effects.

The service life of geomembrane mainly depend to the effect of loss of impermeable plastic diaphragm waterproofing. According to national standards, the thickness of the hydraulic engineering with 0.2m stabilizer plus polyethylene film is up to 40 to 50 years under  clear water conditions and for 30 to 40 years under sewage conditions. Therefore, the useful life of composite geomembrane is sufficient to meet the anti-seepage requirements of the dam life.