重力坝坝体—库水相互作用的振动台试验研究

A shaking table model test on dam-reservoir interaction of gratity dam

结合某重力坝工程,进行了坝体—库水动力相互作用的振动台动力模型试验,研究库水对大坝自振频率及坝面动水压力的影响,同时辅以数值计算,将目前工程上应用广泛的韦斯特伽德库水附加质量模型以及库水有限元模型的计算结果与模型试验成果进行比较。结果表明,库水有限元附加质量模型能更好模拟库水对坝体动力特性和地震动力反应的影响,而韦斯特伽德库水附加质量模型夸大了库水的动力影响,建议在适当折减的基础上采用。

The authors presented a dynamic shaking table model test results of a gravity dam project, in which the influence of reservoir water on hydrodynamic pressure upon the dam surface and the natural frequencies of dam was studied. Aiming at verifying the hydrodynamic pressure numerical analysis methods usually used in engineering practice, a comparison was carried out between test results and corresponding numerical analysis procedures, including the Westergaard add mass model and the water finite element model. The results showed that the reservoir water could significantly decrease the natural frequencies of dam and the water finite element model could reflect this kind of effect of reservoir water more accurately. The test results also showed that the Westergaard add mass model would overestimate the influence of reservoir water. A suggestion of reduction modification on this model was provided.