从本世纪六十年代开始,在国内外的施工实践中明显地出现了在建的混凝土坝减少,而土坝的水利枢纽增加的趋势。据国际大坝委员会的资料,目前每100座在建水坝中有90座是土坝,当然,这包括所有大小不同的坝,其中大型的土坝比重较小。从目前苏联在建的35座水利枢纽看, Beginning in the 1960s, concrete concretions under construction have obviously decreased in construction practices both at home and abroad, while the earth-dam hydropower hubs have been increasing. According to the International Commission on Dams, 90 of every 100 dams currently under construction are earth dams, of course, including all dams of different sizes, of which the proportion of large earth dams is relatively small. From the current Soviet Union in the construction of 35 water conservancy hubs,