Abstract: Xikeer reservoir is located in an area with frequent occurance of earthquakes. Since its completion, the reservoir has experienced six strong earthquakes, each of which has caused varying degrees of damage to the reservoir dam. Analysis of seismic damage characteristics and seismic safety of the dam can provide reference for the design of hydraulic structures in highly seismic region. Firstly, the seismic damage characteristics are summarized based on seismic damage data of the reservoir dam. It is found that cracks and sand boil occur in the dam during each earthquake, and the seismic damage severity is closely related to the earthquake magnitude. Secondly, based on the mechanics test results about dam foundation and dam body, the seismic safety is analyzed from the aspect of liquefaction possibility of dam foundation and cracks in dam body. The results show that the foundation of main dam and auxiliary dam may be liquefied locally, and the dam body is prone to crack by earthquake. Finally, some suggestions on reinforcement measures are put forward.

Key words: homogeneous earth dam, seismic damage characteristics, seismic safety analysis, reinforcement

摘要： 西克尔水库位于地震多发区，水库建成以来已历经6次较强地震，每次地震均造成水库大坝不同程度破坏，总结分析大坝震损特性及抗震安全性，可为今后强震区水工建筑物的设计提供参考。首先基于水库大坝震损资料归纳总结了水库大坝震损特性，发现大坝均出现裂缝和喷水冒砂，坝体震损严重程度与震级密切相关。其次基于坝基和坝体土物理力学试验结果，从坝基液化可能性和坝体裂缝等方面分析了水库大坝抗震安全性，结果表明：主坝和副坝坝基局部有地震液化可能性，地震使坝体易产生裂缝。最后提出了系统除险加固措施建议。

关键词: 均质土坝, 震损特性, 抗震安全分析, 除险加固