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1、水利水电技术第40卷2009年第5期官地重力坝静动力分析111,21何建涛,张伯艳,李德玉,陈厚群(11中国水利水电科学研究院工程抗震研究中心,北京100048;21西安理工大学水利水电学院,陕西西安710048)摘要:对官地混凝土重力坝进行了三维静动力线弹性和非线性有限元分析。非线性分析中用LDDA方法模拟了挡水坝段坝头折坡附近碾压层面、坝基面以及深部滑裂面的力学行为,用粘弹性边界模拟了地震动能量向无限远域逸散的地基/辐射阻尼0效应。计算结果表明,非线性有限元分析所得动力反应较线性有限元(未考虑无
2、限地基辐射阻尼影响)有明显减小(挡水坝段坝趾处主压应力除外)。主要得出了以下可供工程设计参考的结论:挡水坝段坝头折坡处主拉应力较大,需合理配筋;坝趾处主压应力较大,需采取适当措施处理;在计入无限地基辐射阻尼影响后,官地重力坝能达到校核地震作用下的/不溃坝0功能目标。关键词:官地混凝土重力坝;静动力有限元分析;LDDA;粘弹性边界;地基辐射阻尼中图分类号:TV642(271)文献标识码:A文章编号:1000-0860(2009)05-0035-04StaticanddynamicanalysisonG
3、uandiGravityDam111,21HEJian-tao,ZHANGBo-yan,LIDe-yu,CHENHou-qun(11ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing100048,China;21Xi.anUniversityofTechnology,Xi.an710048,Shaanx,iChina)Abstract:A3-Dstaticanddynamiclinearelasticandnonlinearfini
4、teelementanalysisismadeonGuandiGravityDam1Duringthenonlinearanalysis,themechanicalbehaviorsofthedamfoundationsurface,deepslipsurfaceandtherollercompactedlayernearthefoldingoftheabutmentofthewaterretainingsectionofthedamaresimulatedwithLDDAmethod,andthe
5、nthefounda-tionradiationdampingeffectoftheseismicmotionenergydissipatingtowardsinfinitedomainissimulatedaswell1Theresultsshowthatthedynamicresponseobtainedfromthenonlinearfiniteelementanalysisismuchsmallerthanthatfromthelinearone(withoutconsideringther
6、adiationdampingoffoundation),excepttheprincipalcompressivestressatdamtoe;fromwhichtheconclusionthatcanbeprovidedasthereferencefortheengineeringdesignconcernedismainlyobtainedthatthereasonablerein-forcementmustbearrangedatthefoldingoftheabutment,astensi
7、lestressislargertherein;suitabletreatmentmustbedoneatthedamtoeforthelargerprincipalcompressivestressthereandthenthetargetof/non-failuredam0underthecheckseismiceffectcanbegotforGuandiGravityDam1Keywords:GuandiConcreteGravityDam;staticanddynamicfiniteele
8、mentanalysis;LDDA;viscous-elasticboundary;radia-tiondampingoffoundation坝顶长度52913m,最大坝底宽度15312m,总库容1工程概况官地水电站位于四川省凉山彝族自治州西昌市收稿日期:2008-12-25和盐源县交界的打罗村境内,是雅砻江卡拉至江河基金项目:国家自然科学基金重点资助项目(90510017);水利部公益口段水电规划五级开发的第三个梯级电站。官地碾压专项(200701004)资助。混凝
