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拱坝或薄拱坝采用坝身中孔泄洪,是一种较好的泄洪形式。薄拱坝泄洪为短压进水口,水流条件较好,泄洪能力较强,在峡谷混凝土高拱坝的坝体上适宜选用设置中孔泄洪的方案。现已建成和在建的拱坝和薄拱坝采用中孔泄洪的有欧阳海、石门、红岩、托海等工程。一般说来,泄洪孔设置检修闸门,便于管理,是合理的。但是对于拱坝或薄拱坝的泄洪孔口来说,设置检修闸门比较困难,主要是拱坝泄洪中孔所处位置坝体较薄,在结构设计和形体布置方面有些问题不易解决。那么不设置检修闸门是否合理,对水库效益的影响程度如何,成为人们关注和
Arch dam or thin arch dam using the flood in the hole, is a better form of flood discharge. The thin-arch dam flood discharge is a short-pressure water inlet, the water flow conditions are good, and the flood discharging capability is strong. The scheme of setting the middle hole flood discharge is suitable for the dam body of the canyon concrete high arch dam. Now built and under construction in the arch dam and thin-arch dam using the flood hole in the Ouyang Hai, Shimen, Hongyan, Tuo Hai and other projects. In general, it is reasonable to set up a floodgate floodgate for ease of management. However, for flood discharge orifice of arch dam or thin arch dam, it is more difficult to set up floodgate, which is mainly due to the thin dam body where spillway is located, and some problems in structural design and physical arrangement are not easily solved. So do not set the check gate is reasonable, the extent of the impact of reservoir efficiency, as people pay attention and