飞来峡水利枢纽溢流坝体型优化

飞来峡水利枢纽溢流坝初步设计阶段的体型未能消除过闸水流紊乱和闸室内振荡水流现象，对闸室和闸门结构将产生不利影响。施工图设计阶段通过对水工模型试验成果的分析，找出不利水流流态的产生主要与胸墙的型式尺寸，堰顶高程，鼻坎挑角等因素有关，并据此对溢流坝体型进行修改，采用了双胸墙，水平鼻坎等工程措施。

Optimizing the Type of Spillway of Feilaixia Project

The type of spillway for Feilaixia Project selected in the stage of preliminary design will bring unfavourable effects on gate chamber and gate structure since it cannot eliminate the turbulence of flow passing the gate and the oscillating flow inside the chamber. In the stnge of working drawing, through analizing the results of hydraulic model, it is found that formation of unfavourable flow pattern is related to such factors as the type and size of parapet wall, crest elevation and deflector angle of bucket. On this basis the type of spillway has been modif ied with using such engineering measures as double parapet and horizontal bucket. Through verification by hydraulic model, the pattern of flow passing the gate has improved significantly.