目前用合成土工膜系统作为长期措施替代传统的衬砌法 (如混凝土或喷混凝土 )对大坝等水工建筑物进行防渗处理已被大坝工程界广泛接受。土工膜是很薄的合成材料 ,渗透性非常低 ,从 i× 10 - 1 2 ～ i× 10 - 1 3cm/s,在水工和土工建筑物中 ,用于恢复损坏建筑物的不透水性 ,或是 At present, synthetic geomembrane system as a long-term measure to replace the traditional lining method (such as concrete or sprayed concrete) to dam construction and other hydraulic structures for anti-seepage treatment has been widely accepted by dam engineering. Geomembranes are very thin synthetic materials with very low permeability, ranging from i × 10 - 1 2 to i × 10 - 1 3 cm / s in hydraulic and geotechnical structures for the restoration of water impermeability to damaged buildings , Or