长河坝高土质心墙堆石坝抗震安全性研究  

Study of seismic safety of Changheba high rockfill dam with earth core

作　　者：何蕴龙[1] 曹学兴[1,2] 冯蕊[1] 熊堃 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]华能澜沧江水电有限公司,云南昆明650214 [3]长江勘测规划设计研究院,湖北武汉430010

出　　处：《武汉大学学报（工学版）》2014年第1期1-7,共7页Engineering Journal of Wuhan University

摘　　要：采用三维非线性有限元技术,在静力分析的基础上对大坝的动力特性及抗震安全性进行动力反应分析,动力计算中坝体材料及覆盖层采用考虑围压效应的Hardin-Drnevich模型,采用可以考虑围压效应的残余体应变及残余轴应变计算公式对坝体永久变形进行计算.计算结果显示:大坝在地震过程中产生了较为明显的地震动力反应;坝体顶部产生了较为明显的地震永久变形,最大震陷140.6cm,为最大坝高的0.59%;在30s的计算时长中大坝上、下游坝坡稳定安全系数小于1的累积时刻分别为2.56s和2.76s;坝顶以下45m范围内上游反滤层动强度安全系数小于1.根据计算结果提出了相应的建议,供工程设计参考.Three〉dimensional nonlinear finite element analysis is carried out to explore the dynamic properties and seismic safety of the dam on the basis of static calculation. The filling materials of this dam and alluvium deposit are simulated by the HardiwDrnevich constitutive model that could consider the effect of confining pressure. Sol tening modulus method is carried out to calculate the permanent deformation of the dam with residual body strain and residual axial strain calculation formula that could consider the effect of confining pressure. The results demonstrate that： There is a significant seismic dynamic response of the dam during the earthquate. A significant earth quake permanent deformation has taken place on the dam crest with a biggest settlement of 140. 6 cm, which is 0.59% of the maximum dam height. The accumulation time of stability safety coefficient less the 1.0 of both the upstream and downstream is 2.56 s and 2.76 s durning the calculation of 30 s. The dynamic strength safety coefficient of the upstream filter layer 45 m away from the crest is less than 1.0. The corresponding proposals are put forward for the design of the project according the calculation results.

关 键 词：长河坝水电站 高堆石坝 动力反应 永久变形 抗滑稳定 

分 类 号：TV641.1[水利工程—水利水电工程]