地震滑坡涌浪作用下重力坝的损伤分析

Damage analysis of gravity dam suffered from earthquake landslide surge

滑坡所造成的涌浪极易对坝体造成严重的损坏,如果在地震作用时发生滑坡涌浪将会额外增大高坝破坏的风险。通过分析,选择了合理的涌浪压力计算方法,以Koyna混凝土坝为例探讨了地震滑坡涌浪作用下坝体的损伤破坏情况。数值分析结果表明,在同样的涌浪高度情况下,发生在地震过程中不同时刻的涌浪对坝体的影响程度不同,在最不利组合情况下,涌浪压力对坝体上游面的破坏要远大于单纯地震动的影响。

Landslide surge could cause severe damage to dams, and the risk grows higher when the landslide surge happened during the earthquake. In this paper, the reasonable surge pressure model is chosen though analyses. With the example of the Koyna concrete gravity dam, the damage caused by both earthquake and landslide surge was discussed. Numerical results show that, at the same landslide surge height, the landslide surge overlapped with earthquake at different moments cause different damage to dam. The damage at upstream face caused by both land- slide surge and earthquake is much larger than that caused only by earthquake.