大渡河深溪沟水电站工程设计综述

Summary of engineering design of Shenxigou Hydropower Station

深溪沟水电站为大渡河干流规划的第18级电站,坝址位于四川省雅安市汉源县和凉山州甘洛县接壤处。其上一梯级为已投产发电的瀑布沟水电站,下一梯级为正在建设的枕头坝水电站。根据电站坝址区的地形地质条件,经多专业综合比较和物理模型验证,选定的最终枢纽布置方案为:左岸布置3孔泄洪闸、右岸利用2条泄洪冲沙洞(与导流洞结合)承担泄洪任务,泄洪闸与厂房之间布置1孔排污闸排泄库内污物,主河床布置河床式厂房,右岸布置窑洞式安装间。水库正常蓄水位660.00 m,总库容3 200万m3,电站安装4台单机容量165 MW的轴流转浆式水轮发电机组,总装机容量660 MW,年发电量32.35亿kW.h,电站按100 a一遇洪水设计,1 000 a一遇洪水校核。

Shenxigou Hydropower Station is the 18th cascade of hydropower stations planned on the main stream of Dadu River, and located at the contiguous area of Hanyuan County and Ganluo County in Sichuan Province. The upperstream cascade is Pubugou Hydropower Station which is in commissioning, and downstream cascade is Zhentouba Hydropower Station which is under construction. According to geological conditions and comprehensive comparison and verification of physical model, the final layout scheme is that 3 - spillway - tunnel sluice is on left bank of the dam and two flood and sediment releasing tunnels are on the fight bank to bear the task of flood discharge combined with diversion tunnel; one trash sluice is between release sluice and powerhouse to discharge the trash in the reservoir; the powerhouse is on the main fiver bed; U -type installation chamber is on the right bank. The normal water level is 660.00 m with correspondent capacity of 32 million m3 ; 4 axial - flow Kaplan turbines with unit capacity of 165 MW are installed. The annual energy output is 3. 235 billion kW. h. The hydropower station is designed by 100 - year flood frequency standard and checked by 1000 - year frequency standard.