The purpose of this study is to propose an impact analysis model to explore the effect of the post-earthquake landslide surge on local damage to ultra-high arch dams. Based on the existing pressure model of landslide-generated waves impacting the dam, nonlinear dynamic analysis is conducted on a high arch dam subjected to the landslide surge of different surge heights after the earthquake, through numerical simulation. According to the theory of nonlinear least squares, the relationship between the surge height and the damage value of all dam elements is fitted with a Sigmoid function, and the results show good fitting performance. This result proves that the proposed impact analysis model can well reflect the influence of the surge height on the local damage to arch dams. In addition, three parameters are defined based on this model. The influence of the post-earthquake landslide surge on the local damage of arch dams at different positions is analyzed based on these three parameters, and the vulnerable positions of the dam body under the impact of the post-earthquake landslide surge are determined. The model has important significance for the safety evaluation of dams affected by landslide-generated waves after an earthquake.

本研究的目的是提出一种影响分析模型，探讨震后滑坡潮对特高拱坝局部损坏的影响。基于现有的滑坡冲击坝压力模型，通过数值模拟，对震后不同涌浪高度的滑坡涌浪作用下的高拱坝进行非线性动力分析。根据非线性最小二乘理论，用Sigmoid函数对涌高与各坝体损伤值之间的关系进行拟合，结果显示出良好的拟合性能。这一结果证明所提出的影响分析模型能够很好地反映浪涌高度对拱坝局部破坏的影响。此外，基于该模型定义了三个参数。基于这三个参数，分析震后滑坡涌流对不同位置拱坝局部损伤的影响，确定坝体在震后滑坡涌流冲击下的脆弱位置。该模型对于地震后受滑坡波影响的大坝安全评价具有重要意义。