台阶消能在大田河水电站前池溢洪道中的应用

Application of Steps Dissipation Energy in Forebay Spillway of Datian River Hydropower Station

受地形条件限制,大田河水电站二级电站前池溢洪道泄槽采用沿程台阶和末端消力池消能。初次设计采用台阶粗糙度和台阶溢洪道通用曲线计算泄槽水深。根据电站试运行情况反馈,溢洪道下泄一半设计流量时,陡槽段出现局部水波溅出。设计引入消能率进行泄槽水力学复核计算,从而确定边墙和消力池加高,同时加强新老混凝土结构结合细节处理,实施后经过多年运行实践,状况良好。

Limited by the terrain conditions,gradient step dissipation and end stilling pool dissipation were used for the forebay spillway chute in Grade 2 power station of Datian River Power Station.The step roughness and step spillway general curve were used to calculate water depth of the chute in the preliminary design.According to the feedback from test run of the power station,water splashes over the chute section when half of the design flow is released down from the spillway.The energy dissipation rate was introduced to check the chute hydraulics in the design for determining the height of side walls and stilling pools,meanwhile,strengthening the combination of new and old reinforced concrete structure and details processing.The practice shows that it operates well over the years.