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防止坝基中的渗漏十分重要。因为很多工程的失事是由于基岩中的渗漏造成的。例如,前面已经提到的美国圣-佛兰西斯重力坝的失事,就是因为渗漏使坝基中的第三系红色砾岩强度降低而引起的。又如,1871年在阿尔及利亚建成的弗尔古(Fergoug)重力
It is important to prevent seepage in the dam foundation. Because many of the engineering crashes are due to seepage in bedrock. For example, the aforementioned crashes of the St-Francis Gravity Dam in the United States were caused by a decrease in the strength of Tertiary red conglomerate in the dam foundation caused by seepage. Another example is the Fergoug gravity built in Algeria in 1871