水力发电学报2026，Vol.45Issue(6)：64-76,13.DOI:10.11660/slfdxb.20260606
考虑不同库底淤积层厚度的土石坝地震响应研究
Seismic response of earth-rock dams considering varying thickness of reservoir bottom sediment layers
摘要
Abstract
Based on the theory of fluid-structure interaction,this paper develops a dynamic simulation method that accounts for the compressibility of reservoir water and the effect of bottom sediment layers.It models water as an acoustic medium,and uses boundary impedance conditions to simulate the absorption and reflection effects of sediment layers on wave energy.Accordingly,we can transform the sediment layer problem into one-dimensional wave propagation through the foundation depth,and analytically derive the corresponding boundary parameters.Validation shows the method effectively captures the dynamic response of sediment layers with varying thicknesses.In a specific case study,we construct a three-dimensional finite element model for dam-reservoir water-sediment-foundation system of a real asphalt-concrete core rockfill dam,and simulate its dynamic behaviors at different sediment layer thicknesses.The results indicate that sediment thickness has a minor influence on dam displacement,but imposes a significant effect on the dams'hydrodynamic pressure,acceleration,and stress responses.Sediment layers produce suppression on the hydrodynamic pressure,and the suppression is most pronounced in the case of the sediment thickness ranges of 0.1H-0.2H(H is the dam height).This study helps to understand the bottom sediment effect on the dynamic responses of dam-reservoir water-foundation system.关键词
土石坝/库水可压缩性/反射系数/淤积层/地震响应Key words
earth-rock dam/reservoir water compressibility/reflection coefficient/sediment layer/seismic response分类
建筑与水利引用本文复制引用
陈灯红,吴雨,岳梦..考虑不同库底淤积层厚度的土石坝地震响应研究[J].水力发电学报,2026,45(6):64-76,13.基金项目
国家自然科学基金项目(52579127 （）
52079072) （）
