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为研究土石坝在地震波倾斜入射时的动力反应,采用粘性人工边界及其对应的等效荷载地震动输入方法,对某典型土石坝有限元模型,分别计算了SV波和P波以不同角度、不同方向入射时的坝体动力反应,探讨了坝顶加速度放大系数随入射角度的变化规律。结果表明,随地震波入射角度的变化,坝顶加速度反应存在明显的差异,且在入射角度较大时表现得更加显著,说明行波效应的影响增强;此外,地震波自上、下游两侧入射时的结果截然不同。因此,在土石坝抗震设计及安全评价中,考虑地震波倾斜入射以及行波效应的影响是十分必要的。
In order to study the dynamic response of rockfill dams when the seismic wave is incident obliquely, the viscous artificial boundary and its corresponding equivalent ground motion input method are used to calculate the influence of the SV wave and the P wave on the finite element model of a typical earth- The dynamic response of dam body at different incident angles is discussed. The changing law of acceleration factor of dam crest with incident angle is discussed. The results show that with the change of incident angle of seismic wave, there is a clear difference in acceleration response at the crest, which is more significant when the incident angle is larger, which indicates that the effect of traveling wave effect is enhanced. In addition, when the seismic wave is incident on both sides The result is very different. Therefore, in the seismic design and safety evaluation of earth-rockfill dam, it is necessary to consider the influence of oblique incident wave and traveling wave effect.