混凝土坝动水压力与库水可压缩性效应

Hydrodynamic Pressure on Concrete Dams and Reservoir Water Compressibility Effect

基于对 3座拱坝现场迫振实验的理论分析 ,论证了库水可压缩性对动水压力的放大效应及其实现条件 ;基于波传播理论提出了水库边界反射吸收参数的算法 ;论证了模型试验用于动水压力测试的局限性 .研究表明 ,高混凝土坝特别是高拱坝的抗震分析中在一定条件下应考虑可压缩性 。

The result from field forced vibration experiments performed for three arch dams is analyzed theoretically, and the amplification effect of reservoir water compressibility on hydrodynamic pressure is evaluated. Based on the wave propagation theory, an algorithm is proposed for calculation of parameters of wave energy reflection and absorption at reservoir boundaries, and the limitation of model experiments applied to pressure test is demonstrated. It is concluded that compressibility should be taken into account in aseismic analysis for high arch dams, especially for high concrete dams, while the hydrodynamic pressure would not be infinity.