【摘要】 立洲水电站具有河谷狭窄、落差较大、单宽流量也较大等特点,泄洪消能是该水电站的设计和建设中非常突出的关键性技术问题。立洲水电站采用拱坝的1个中孔、2个表孔和水垫塘消能。如果表孔体型优化不当,会造成泄流能力下降,落水冲击岸边,水垫塘底板冲击动压大,泄洪雾化严重。经诸多方案的试验比选,最终推荐方案使坝身表孔水流沿程横向收缩、纵向扩散,在空中呈窄而高且长的流态,从而与中孔的水股互相穿插而不发生碰撞或少碰撞,减弱了因水流空中碰撞所造成的泄洪雾化,落水不再冲击岸边,同时使水垫塘底板冲击动压处在较低的范围内。更多还原

【Abstract】 Considering Lizhou power station’s great head,unit discharge,with confined valley at its location,its energy dissipating becomes the major issue during its design and construction.It has an arch dam with one middle outlet,two surface outlet and a plunge pool.So,once the surface outlet type fails to be proper,it will obtain some undesired results,such as discharge capability reduces,droplets scours the banks downstream the dam,impact pressure maintains high at the bottom of the pool and atomization is severe.After plenty of experiments,the optimization type which makes flow contracting at lateral direction but diffusing at longitudinal direction is obtained.By this way,the undesired results mentioned above is under control.更多还原