澜沧江小湾水电站枢纽布置

小湾水电站是澜沧江中下游河段八个梯级中的龙头水库工程，地处高山峡谷，地质条件较复杂又属高地震烈度区；双曲拱坝高２９２ｍ，是当今拟建拱坝世界之最；泄洪总功率４６０００ＭＷ，也是世界第一，泄洪消能问题突出且难度大；地下厂房规模巨大，给枢纽布置带来较大困难．经多方案分析比较，以优选坝线为主线，综合考虑研究论证后，推荐出适宜地形地质条件，满足工程要求的枢纽布置最佳方案．

Layout Of the Hydro-junction of Xiaowan Hydropower Station

Xiaowart Hydropower Station is the leading reservior project of the eight cascade hydropower stations in the middle and lower reaches of the Lancang River. The station is actuated in high mountains and deep gorge with complex geological settings and high seismic intensity. It has a 292 m high double curvature arch dam leading the world arch dams to be constructed so far. Total power of flood discharge is of 46000 MW taking the first place in the world as well. It is prominent and difficult to dissipate the discharge energy. Since the underground powerhorse is tremendous,more difficulties would be brought to arrange the layout of hydro-junction. Having analysed and compared with many alternatives,take the optimum dam axis to be the main axis.After having studied and verified comprehensively,an optimum plan is put forward with suitable topographic and geological conditions to meet the need of the engineering.