黄河拉西瓦双曲拱坝抗震安全分析评价

Analysis and Evaluation of Seismic Safety of Laxiwa Double Curvature Arch Dam in the Yellow River

拉西瓦双曲拱坝最大坝高250m,坝址所处地区地震活动性强,为此,根据DL5073—2000《水工建筑物抗震设计规范》的原则、方法和要求,在考虑地形地质条件、地基辐射阻尼及横缝非线性影响的条件下,采用三维有限元法对大坝及其基础进行动、静力分析,并用水弹性模型试验进行验证,综合分析评价了大坝抗震安全性能。分析结果表明,拉西瓦拱坝的抗震安全性是有保证的。

The Laxiwa double curvature arch dam, with the maximum dam height of 250 meters, is located in an area with strong seismic activity. For this reason according to the principles, methods and requirements of the Anti-selsmic Design Code of Hydraulic Structures （DI5073-2000） and with consideration of the radiation damping of foundation, the nonlin- ear influence of transverse joints of dam and its geographic and geological conditions, we use 3D finite element method to make the dynamic and static stress analysis and use the hydro-elastic model to test for verifying the analysis results, Therefore the performances of seismic safety of dam were comprehensively analyzed and assessed. The results showed that the seismic safety of Laxiwa double-curvature arch dam is satisfied.