那新水电站溢洪道出口挑坎结构形式的试验研究  

Test Research on Flip Bucket Structure of Spillway Outlet at Naxin Hydropower Station

作　　者：姚文玲 

机构地区：[1]广西水利科学研究院,南宁530023

出　　处：《红水河》2007年第4期32-34,43,共4页Hongshui River

摘　　要：广西那新水电站河岸式溢洪道轴线与下游河道斜交、河床狭窄,增加了消能防冲设计难度。针对溢洪道出口原设计方案挑射水流较集中,部分水流落在坎后岸坡上,危害岸坡及挑坎安全的现状,经水工模型试验修改,最终提出"双向扩散斜鼻坎+内转式右边墙+挑坎段分流导向墩"的消能工结构型式,使出坎水流顺河向扩散,在空间形成近似"ш"字形水舌,强化了水流在空中消能与掺气,改善下游流态及确保岸坡安全,取得明显效果。Naxin Hydropower Station has a spillway axis crossing obliquely with downstream river channel where the river bed is narrow, which brings about more difficulties for energy dissipation and erosion prevention design. According to the original design, there are concentrated jet flows at spillway outlet, and some flows that fall on bank slope behind the bucket endanger both bank slope and flip bucket. In view of this, an energy dissipation structural model of ＂bilateral diffusion bevel bucket ＋ aversion type right wall ＋ distributary guide pier at flip bucket section＂ is developed through hydraulic model test, which diffuses flows from the bucket down the river to form an Ш shaped water jet. As such, downstream flow pattern is improved, and the safety of bank slope can be ensured as both dissipation and aeration of flows in the air are strengthened.

关 键 词：河岸式溢洪道 出口挑坎 水舌落点 消能效果 那新水电站 

分 类 号：TV653.3[水利工程—水利水电工程]