地震强度对Upper San Fernando土坝流动变形的影响
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摘要
对UpperSanFernando土坝进行一组抗震性能分析,采用基于与状态相关的剪胀性理论的临界状态砂土模型,描述土在所有可能加载条件下的响应.除了给出土坝的总体位移及变形状况外,还提供了土在局部位置的应力路径和应力应变关系.堤坝变形的计算值与现场观测的结果非常接近.
The antiseismic performance of an earth dam is determined not only by its geometry and composition, but also by the intensity of an earthquake to which the dam is subjected. A series of fully coupled finite element analyses of the response of the Upper San Fernando Dam to earthquakes of different intensities are presented for the study of the impact of the earthquake intensity on flow deformation of the earth dam. A critical state sand model cooperating with the concept of statedependent dilatancy is employed to describe the soil behavior under all of the loading conditions. The analyses provide not only the global displacement and deformation of the dam, but also elemental soil responses at representative locations. The calculated deformation of the dam is in good agreement with the observed data.
The antiseismic performance of an earth dam is determined not only by its geometry and composition, but also by the intensity of an earthquake to which the dam is subjected. A series of fully coupled finite element analyses of the response of the Upper San Fernando Dam to earthquakes of different intensities are presented for the study of the impact of the earthquake intensity on flow deformation of the earth dam. A critical state sand model cooperating with the concept of statedependent dilatancy is employed to describe the soil behavior under all of the loading conditions. The analyses provide not only the global displacement and deformation of the dam, but also elemental soil responses at representative locations. The calculated deformation of the dam is in good agreement with the observed data.
引文
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[9]CASTROG,SEEDRB,KELLERTO,etal.Steady statestrengthanalysisofLowerSanFernandoDamslide[J].JournalofGeotechnicalEngineering,ASCE,1992,118(3):406—427.
[2]ZIENKIEWICZOC,PASTORM,CHANAHC,etal.Computationalapproachestothedynamicsandstaticsofsaturatedandunsaturatedsoils[A].In:BANERJEEPK,BUTTERFIELDR,eds.AdvancedGeotechnicalAnalyses[C].LondonandNewYork:ElsevierAppliedScience,1991.1—46.
[3]BYRNEPM,JITNOH,SALGADOF.Earthquakeinduceddisplacementsofsoil structuresystem[A].Proc10thWorldConfonEarthquakeEngrg[C].Madrid,Spain:AABalkema,Rotterdam/Brookfield,1992.1407—1412.
[4]MORIWAKIY,BEIKAEM,IDRISSIM.NonlinearseismicanalysisoftheUpperSanFernandoDamunderthe1971SanFernandoearthquake[A].Proc9thWorldConfonEarthquakeEngrg[C].TokyoandKyoto:JapanAssociationforEarthquakeDisasterPrevention,1989.237—241.
[5]MORIWAKIY,TANP,JIF.SeismicdeformationanalysisoftheUpperSanFernandoDamunderthe1971SanFernandoearthquake[A].In:DAKOULASP,YEGIANM,HOLTZRD,eds.GeotechEarthquakeEngrgandSoilDynamicsIII(GSP75,ASCE)[C].Washington:UniversityofWashington,1998.854—865.
[6]WUG.Earthquake induceddeformationanalysesoftheUpperSanFernandoDamunderthe1971SanFernandoearthquake[J].CanGeotechJ,2001,28:1—15.
[7]LIXS,DAFALIASYF.Dilatanceforcohesionlesssoils[J].Gotechnique,2000,50(4):449—460.
[8]BEENK,JEFFERIESMG.Astateparameterforsands[J].Gotechnique,1985,35(2):99—112.
[9]CASTROG,SEEDRB,KELLERTO,etal.Steady statestrengthanalysisofLowerSanFernandoDamslide[J].JournalofGeotechnicalEngineering,ASCE,1992,118(3):406—427.
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