典型的大坝安全实践是避免采用土坝坝顶溢流的溢洪道,因为这种建筑物覆盖了土坝的表面,使大坝安全问题的直观指标,如渗流、坝坡失稳、内部侵蚀、坝内动物巢穴等被隐蔽起来,致使大坝一旦有安全隐患时人们难以察觉。然而,某些现有大坝需要提高泄洪能力,而两岸又无空间布置岸边溢洪道时,设置坝顶溢洪道不失为一个可行的办法。 A typical dam safety practice is to avoid the use of overflow spillway at the top of an earth dam as it covers the surface of the earth dam and provides visual indicators of dam safety problems such as seepage, slope instability, internal erosion, Dams inside the nest were hidden, resulting in a safety hazard once the dams people difficult to detect. However, some existing dams need to improve flood discharge capacity, and no cross-bank spillway layout on both sides of the river, the establishment of crest spillway is a feasible solution.