杨房沟高拱坝防震抗震设计研究

Study on Seismic Design of Yangfang Ditch High Arch Dam

杨房沟混凝土双曲拱坝最大坝高155 m,坝址所处地区地震烈度相对较大,为此,除了按DL5073—2000《水工建筑物抗震设计规范》的原则、方法和要求进行常规抗震分析外,同时还考虑坝址地形地质条件、计入地基辐射阻尼和横缝张开影响的三维非线性有限元法对大坝及基础进行动力分析,综合分析评价了大坝的抗震性能与抗震安全性。研究结果表明,杨房沟高拱坝在设计地震和校核地震作用下,坝体应力状况较好,坝体横缝最大张开度不会破坏横缝止水设施,满足设计要求。采取的抗震措施能够进一步提高拱坝的整体性和抗震性,杨房沟高拱坝的抗震安全是可以保证的。

Yangfanggou concrete double curvature arch dam with the maximum dam height is 155 m , the dam site area of seismic intensity is relatively large , therefore , in addition to the “specifications for seismic design of hydraulic structures” （DL 5073—2000） principle methods and requirements of conventional seismic analysis , but also consider the topographic and geologic condition ,considering Foundation radiation damping and transverse joint 3D nonlinear finite element method for the dynamic analysis of effects of opening of the dam and its foundation , comprehensive analysis and evaluation of the seismic performance and seismic safety of dams.The results show that , in Yangfanggou high arch dam in the seismic design and check under the action of earthquake , the dam stress condition is good , the maximum opening will not damage the transverse sealing facilities slit dam cross , meet the design requirements.The seismic measures to further improve the integrity of arch dam and earthquake , the seismic safety of Yangfanggou dam can be guaranteed.