拱坝挑流坎的优化与水垫塘底板压强研究

Research on Optimization for Arch Dam's Bucket and Pressure Intensity on Cushion Pool Floor

试验研究了拱坝挑流泄洪时优化闸墩墩尾形状对水垫塘底板上最大冲击压强的影响,结果表明对减小冲击压强有显著效果;从力学观点出发,构造了对水垫塘底板上相对最大冲击压强的表达式,其中包括四个参数,它适用于等宽挑坎和扩散坎,用28个工程实测数据进行了拟合,实测值和计算值的相对误差在可接受范围内。

The experimental tests are made for the effect of pier tail optimization on the decrement of maximum pressure acting on the cushion pool floor when arch dam overflowing.The results show that this method is very effective.From the point of physical view,the empirical formula for the maximum pressure on the cushion pool floor is devised,which includes four parameters and is suitable for the calculation of the equal width bucket and diffusion bucket.By fitting with the measured data from 28 projects,it is showed that the relative error between the measured value and calculated value is in the allowed range.