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朗江水电站溢流坝初设为实体重力坝,技施设计阶段通过优化设计,采用平面弹性力学有限元法对于不同空腹形状计算论证,空腹形状选定为斜椭圆形空腹,总开孔率为35％。通过优化设计,改善了坝基扬压力、节省了砼工程量、又可以提高在设计洪水下的抗滑稳定安全度。
The overflow dam of Longjiang Hydropower Station was initially set up as a solid gravity dam. During the technical design stage, through the optimization design, the plane elasticity mechanics finite element method was adopted to calculate and demonstrate the different fasting shapes. The fasting shape was selected as oblique oval fasting, 35%. By optimizing the design, it improves the pressure of dam foundation, saves the amount of concrete work, and improves the anti-skid stability and safety under design flood.