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三门峡水利枢纽是我国五十年代建设的大型水利工程。水库蓄水以后,发现泥沙淤积严重,自1964年起曾进行两次改建。为满足泄流排沙的需要,重新打开了8个原已封堵的大坝底部施工导流底孔,使水库泥沙淤积问题基本解决,并发挥了综合利用效益。但是,多泥沙的高速水流对大坝底孔的冲刷十分严重。运行十多年以后,底孔的底板被磨蚀,局部洼坑深达10～20厘米,钢筋裸露。底孔进口的事故检修闸门(3×11米)由于门槽的正向轨被磨
Sanmenxia Water Control Project is a large-scale water conservancy project constructed in the 1950s. After the reservoir was impounded, siltation was found to have been serious and two alterations have been carried out since 1964. In order to meet the needs of discharge and sediment discharge, reopened eight previously blocked bottom of the dam construction diversion bottom hole, the reservoir sedimentation problem basically solved, and played a comprehensive utilization of benefits. However, the erosion of the bottom hole of the dam is very serious with the sediment of high velocity. After more than a decade of operation, the floor of the bottom hole is abraded and the local potholes are as deep as 10 to 20 cm with bare bars exposed. Bottom hole entrance of the accident inspection gate (3 × 11 meters) due to the gate groove of the track was ground