目前,苏联用聚合物薄膜作防渗材料正在日益增多,在许多情况下,已成为土石坝防渗的主要措施,其主要原因考虑到下面一些经济因素:(1)与其它防渗设施比较,薄膜防渗层的费用较低;(2)可减少劳动力;(3)不需要专门的设备和机械装置。在苏联,采用聚合物薄膜作为防渗材料的大型水工建筑物(不包括渠道)已有126个。 At present, the anti-seepage materials made of polymer films in the Soviet Union are increasing day by day. In many cases, they have become the major measures for seepage control of earth-rock dam. The main reasons for this include taking into account the following economic factors: (1) Compared with other seepage control facilities, Thin film impermeable layer of lower costs; (2) can reduce labor; (3) does not require specialized equipment and mechanical devices. In the Soviet Union, there are 126 large-scale hydraulic structures (excluding channels) that use polymer films as impermeable materials.