西津水利枢纽二线船闸总体布置方案

General layout scheme of second-line ship lock of Xijin hydro-junction project

西津水利枢纽位于C形弯曲河段,枢纽两岸为高耸山体,受已建设施安全及运行条件限制,二线船闸闸位选择和平面布置难度较大。在总结类似工程建设经验的基础上,根据西津水利枢纽工程特点,针对性提出闸位选址原则,从已建枢纽设施安全与功能影响、船闸工程通航水流条件、工程占地和拆迁面积、施工方案、运行管理便利性、开挖工程量与工程投资等方面,采用定性分析与定量计算相结合对二线船闸闸位方案进行多方案比选。结合物理模型试验研究,优化上下游隔流堤长度,改善上下游引航道口门区通航水流条件。经现场运行检验,推荐方案船闸通过能力能够满足设计要求,达到高效通航的目标。提出的闸位选址原则和研究方法可为类似高水头库区船闸总体布置提供借鉴。

Xijin hydro-junction project is situated in a C-shaped curved section of the river with towering mountains on both sides.Due to the safety and operation conditions of the built facilities,it is difficult to select the location and plane layout of the second-line ship lock.On the basis of summarizing the construction experience of similar projects,according to the characteristics of Xijin hydro-junction project,this paper puts forward the principles of lock location selection.The principles take into account factors such as the impact on existing hub facilities in terms of safety and functionality,navigable water flow conditions at the lock site,project area and demolition requirements,construction scheme feasibility,convenience of operation and management,excavation volume,and project investment.The combination of qualitative analysis and quantitative calculation method is used to compare and select an optimal position for the second-line ship lock.Combined with the physical model test,the length of upstream and downstream barrier is optimized to improve the navigable flow conditions in the entrance area of the upstream and downstream approach channel.Field operation tests confirm that the proposed lock s passage capacity meets design requirements and achieve efficient navigation goals.The principle and research method of lock-location proposed can provide reference for the general arrangement of locks in similar high head reservoir area.