考虑围压效应的高土石坝动力响应分析  

Dynamic Response of High Rockfill Dam Considering Confining Pressure Effect

作　　者：曹学兴[1,2] 何蕴龙[1] 熊堃 冯蕊[1] 王超[4] 岑威钧[5] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点试验室,武汉430072 [2]华能澜沧江水电有限公司,昆明650214 [3]长江勘测规划设计研究院,武汉430010 [4]天津大学水利工程仿真与安全国家重点实验室,天津300072 [5]河海大学水利水电学院,南京210098

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第2期116-123,共8页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(50679058;51009055)

摘　　要：试验结果表明土石材料的动力特性参数有很强的围压依赖性,所以在高土石坝动力计算分析中考虑围压效应是十分必要的.在广泛应用的Hardin-Drnevich本构模型的基础上,提出了改进动剪切模量与动剪应变关系式及阻尼比与动剪应变关系式的方法,得到一个可以考虑围压效应的改进模型,与实际工程试验曲线对比结果表明,新模型可以较好地模拟土石料在各个围压下的动力特性.根据新模型编制相应计算程序并应用于长河坝高土石坝地震动力反应分析中,得到了大坝整体动力反应规律与大坝地震永久变形,为工程设计提供参考.Experimental results show that the dynamic properties of rockfill are strongly dependent on confining pres-sure effect. Therefore,it is very necessary to consider confining pressure effect in the seismic calculation and analysis of high rockfill dam. The relationship between dynamic shear modulus and dynamic shear strain and that between damping ratio and dynamic shear strain were improved on the basis of widely used Hardin-Drnevich constitutive model in this paper. Then a new model considering confining pressure effect was established. The new model can well simulate the dynamic properties of rockfill of a practical project under various confining pressures. A correspond-ing computational procedure was compiled and applied in the dynamic response analysis of Changheba dam. The dy-namic response features and the permanent deformation of the dam were obtained,which could provide the reference for engineering design.

关 键 词：围压效应 高土石坝 动力反应 永久变形 

分 类 号：TV641.1[水利工程—水利水电工程]