同一收缩比下的三角分流墩体型优化研究  

Optimization research on shape of triangular diffluent pier with same ratio of contraction

作　　者：张小飞[1] 骆文广[1] 蔡伟霞[1] 张传军[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2014年第1期220-226,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51069001)

摘　　要：为了找出消能高效且结构合理的挑流鼻坎三角分流墩结构型式,在广西河池市的拉纳水利枢纽水工模型试验中,通过从消能效率、河床冲刷程度、水流流态等方面,研究了同一收缩比条件下的三角分流墩的体型对消能效果的影响,并利用有限元方法对上游顶角进行加圆处理后的三角分流墩进行了应力分析。研究结果表明,同一收缩比下的三角分流墩,分水比越大,分流墩的上游顶角越小;分流墩的消能率越大,且水流在下游河床冲刷深度会越小,因此对下游河床冲刷的影响也会越小;并对分流墩上游顶角进行143°加圆处理后分流墩应力分布对结构安全最有利。即在同一收缩比下的三角分流墩当上游顶角小且沿断面分布均匀时,其消能效果最好,这一结论可以为分流墩在实际工程中的应用作出理论依据。In order to obtain a reasonable structure of the triangular diffluent pier to assist flip bucket to dissipate energy efficiently, different designs were put into the model test of Lana hydroproject in Heehi, Guangxi to study the impact of different triangular diffluent structures on the energy dissipating efficiency, river bed scouring and flow regime under the same contraction ratio, and the finite element method was used to analyze the stress distribution of the rounded upstream vertex angle of the triangular diffluent piers. The larger the diversion ratio of the triangular diffluent pier with the same ratio of contraction is, the smaller the upstream vertex angle of the diversion pier is. There- fore, the energy dissipation ratio of the diversion pier is larger. The results also show that the scour depth of downstream riverbed can be smaller, so the impact on the downstream riverbed scour will be weaker. And the stress of the upstream vertex angle of the triangular diffluent pier is the safest to the structure if it is 143°-rounded. The effect of energy dissipation is the best when the upstream vertex angle of the triangular diffluent pier is small and well distributed on the section under the same contraction ratio. The findings can make theoretical basis for the application of diversion pier in engineering.

关 键 词：同一收缩比 优化 三角分流墩 结构型式 上游顶角加圆 

分 类 号：TV653.9[水利工程—水利水电工程]