地震作用下拱坝—库水耦合振动动水压力分析

Hydrodynamic Pressure Analysis of Arch Dams with Dam reservoir Interaction

拱坝在地震作用下 ,受库水、基岩以及不均匀变化谷壁等的影响 ,动态特性十分复杂。尤其大型的高拱坝 ,振动频率低 ,径向变位大 ,库水对坝体振动的影响变得更加重要。本文结合小湾电站 2 90米高拱坝 ,在考虑坝水流固耦合振动影响下 ,分析和计算了拱坝上游坝面承受的动水压力 ,并特别对自由表面重力波的影响问题、库底对压力波的吸收问题、水体压缩性的影响以及库水域的有效影响范围等进行分析。

Arch dam is one of the large scale structures in hydroelectric projects. Under the excitation of dynamic loads such as earthquakes, the dynamic behavior of dam becomes quite complicated because of boundary effects of earthquake wave propagation, reservoir water structure interaction, and dynamic stress concentration etc. In this paper the hydrodynamic pressure of Xiaowan arch dam, height of 292m, due to action of earthquake was analyzed in consideration of dam reservoir water interaction. Much attention was also paid to the effects of surface gravity wave, energy absorption of reservoir bottom, compressibility of water, and so on. It is concluded that the fluid structure interaction must taken into account in the analysis of a high arch dam under excitation of earthquake. [WT5HZ]