金安桥水电站宽戗堤立堵截流设计与实践

Design and Practice for Closure of Berm-Dam ofAnjinqiao Hydropower Station

金安桥水电站是金沙江中游河段第一座截流的电站，截流设计标准及流量为P=10％，12月中旬，流量889m3／s。经水力学计算及模型试验验证，若采用单戗堤截流，截流具有截流落差大、龙口流速大、单宽功率高等特点。鉴于单戗堤截流难度较大，双戗堤截流在本工程不具优势，设计提出采用宽戗堤（顶宽50m）立堵截流方案，经实践证明是合理可行的，截流过程顺利。

Anjinqiao Hydropower Station is the first river closure hydropower station on the middle reaches of Jiasha River, the river closure design standard and flow is P=10%. In the middle December, the flow is 889m3/s. According to the hydraulic calculation and model experimental verification, if the single berm-dam closure, the river closure has the characteristics of large fall, high port flow rate, high single wide power. Whereas the single berm-dam closure is difficult, double berm-dam closure does not have advantage in the project. Accordingly, the design proposes to adopt the wide berm-dam closure （design height 50m）, which is reasonable and feasible through practice, and the closure process is smooth.