正在建设的黄河小浪底水利枢纽工程与黄河干流上的其他5座水库有一个明显的不同,就是在坝身之下、河床之中,还设计有一道长440m、厚1.5m、最深处达81m 的混凝土防渗墙。目前,这一国内最深的主坝防渗墙、也是小浪底水利枢纽工程的关键性项目已全线完工。这一被称为“坝下之坝”的防渗墙之所以关键,主要是因为小浪底水库坝址的地质条件极 One of the obvious differences between the Xiaolangdi Hydro Project under construction and the other five reservoirs on the mainstream of the Yellow River lies in the riverbed, which is also designed with a length of 440m, a thickness of 1.5m and a depth of 81m Concrete cutoff wall. At present, the deepest main dam cutoff wall in China and the key project of Xiaolangdi Multipurpose Dam Project have been completed across the board. This is known as the “dam under the dam,” the reason why the cutoff wall is mainly due to the geological conditions of Xiaolangdi reservoir dam pole