Arch dam-reservoir-foundation interaction analysis based on the acoustic-structure coupling method

Abstract

To study the influence of the absorption boundary condition at the bottom of an arch dam on the hydrodynamic pressure distribution and dynamic response of the arch dam, this paper simulates the surface gravity wave, the reservoir bottom absorption boundary, the coupling boundary at the interface between the dam and the reservoir, and the radiation boundary at the reservoir tail on the basis of the acoustic-structure coupling method and impedance boundary condition. The accuracy of the proposed model is verified by numerical examples. With Dagangshan arch dam taken as an example, the finite element model of the arch dam-reservoir-foundation system is established, and the hydrodynamic pressure distribution on the dam face and hydrodynamic response of the dam under different single reservoir bottom reflection coefficients are analyzed. Findings indicate that the larger the reservoir bottom reflection coefficient, the larger the amplitude of hydrodynamic pressure; and the closer the reservoir bottom, the more obvious this effect. A comparison of the dynamic pressure distribution of dam surface under the condition of variable bottom reflection coefficient and single bottom reflection coefficient indicates a great difference. Thus, the dynamic response of the dam body under the condition of variable bottom reflection coefficient can be properly considered in practical engineering.