简介：Chinaisacountryofhighseismicitywithmanyhydropowerresources.Recently,aseriesofhigharchdamshaveeitherbeencompletedorarebeingconstructedinseismicregions,ofwhichmostareconcretedams.Theevaluationofseismicsafetyoftenbecomesacriticalproblemindamdesign.Inthispaper,abriefintroductiontomajorprogressintheresearchonseismicaspectsoflargeconcretedams,conductedmainlyattheInstituteofWaterResourcesandHydropowerResearch(IWHR)duringthepast60years,ispresented.Thedamsite-specificgroundmotioninput,improvedresponseanalysis,dynamicmodeltestverification,fieldexperimentinvestigations,dynamicbehaviorofdamconcrete,andseismicmonitoringandobservationaredescribed.Methodstopreventcollapseofhighconcretedamsundermaximumcredibleearthquakesarediscussed.

简介：Themechanismsofseismically-inducedliquefactionofgranularsoilsunderhighconfiningstressesarestillnotfullyunderstood.Evaluationofthesemechanismsisgenerallybasedonextrapolationofobservedbehavioratshallowdepths.ThreecentrifugemodeltestswereconductedatRPI'sexperimentalfacilitytoinvestigatetheeffectsofconfiningstressesonthedynamicresponseoradeephorizontaldepositofsaturatedsand.Liquefactionwasobservedathighconfiningstressesineachofthetests.Asystemidentificationprocedurewasusedtoestimatetheassociatedshearstrainandstresstimehistories.Thesehistoriesrevealedaresponsemarkedbyshearstrengthdegradationanddilativepatterns.Therecordedaccelerationsandporepressureswereemployedtogeneratevisualanimationsofthemodels.Thesevisualizationsrevealedaliquefactionfronttravelingdownwardandleadingtolargeshearstrainsandisolationofuppersoillayers.

简介：Inthisresearch,thevibrationofelevatorropes,includingthemainropeandcompensationropeareinvestigatedsimultaneouslyinahigh-riseelevatorsystemunderearthquakeexcitation.Moreover,thepaperpresentsanewcontrolmethodtorestraintheswayofbothropes.Thisstudyconsidersvaryingropelengthsduringelevatoroperationwhichcauseothersystemparameterssuchasnaturalfrequency,anddampingratiotobetime-variantvariables.Thedynamicsoftheropesareanalyzedbysolvingthegoverningnon-stationary,nonlinearequationnumerically.Inordertomitigatethevibrationofropesinseveralmotionconditions,particularlyupwardsmovement,downwardmovement,stoppedatthelowestposition,andstoppedatthehighestposition,anactiveequipmentisinstalledatthecompensationsheave.Thestabilityofthesystemusingthecontrollerisanalyzedatfourstates:withoutdisturbanceandstaticcar,withoutdisturbanceandmobilecar,includingdisturbanceandstaticcar,andincludingdisturbanceandmobilecar.Theefficiencyofthecontrollerusedfordampeningthevibrationofelevatorropesisvalidatedbynumericalsimulationresults.

简介：Inthispaper,weadopttheobservationdataoftwo10HzYRY4-componentboreholestrainmetersandone100HzFBS-3BbroadbandseismometertostudytheresponsesoftheirobservationstotheApril11,2012MW8.6earthquakeoffthewestcoastofnorthernSumatra,andcomparetheresponsecharacteristicsduringthecoseismicstageafterpreprocessingofthedata.Weanalyzethespectrum’sdynamicprocessduringthecoseismicstagewiththeStransformationmethod,anddiscussthespectrum’sdetailsindifferentseismicphases.TheStransformationresultsofthedataofseismometerandboreholestrainmeteratthesamestationshowthatthecoseismicspectrumevolutionofthetwokindsofobservationaresimilartoeachotherandcanbecross-referencedinindentifyingthewavesignals,whichprovesthattheboreholestrainmetermeasurementsathighfrequenciesarereliable.

简介：从火车装载的交通引起的一个磁道的永久解决的预言和控制对高速度的铁路设计和维护关键。在这研究，在铁路建设使用的geomaterials的积聚的变丑的一个统一预言模型使遭到了到周期的装载被介绍并且校准了使用物理模型测试。基于这个万用的模型，在火车的车轮轴的运动引起的重复装载下面决定轨道结构解决的一条计算途径被建议。测试的物理模型上的回归分析被采用决定涉及计算途径的参数。模型测试数据和从背分析获得的参数在整个各种各样的测试是一致的计算结果表演的比较调节，并且建议计算途径能够令人满意地为各种各样的轴负担预言铁路路基和路基土壤的积聚的解决，装载骑车。一条高速度的铁路的案例研究被执行在现实主义的工程应用表明建议途径的可行性。从路基和路基土壤的解决发展的计算结果被介绍并且讨论。关键词周期的装载-总数-泥土-积聚的解决-旁边支持的高速度的铁路：不到资助号码50538010的中国的国家自然科学基础，10702063；在资助号码2008G005-D下面的铁路的中国部的技术提升工程

简介：为了与河床探索一个高楼堆积帽子基础的地震表演，搜索，为基础的一个有限元素模型在OpenSees有限元素框架被介绍。在模型，一个纤维元素被用来模仿堆积柄，一个非线性的p-y元素被用来模仿土壤堆积相互作用，并且p因素方法被用来反映组效果。全球的A和本地人搜索模型被建议，在哪个二个参数，在在上游的堆积的scour深度的堆积和下游的堆积的一样的排的scour深度，被包括学习影响在基础上搜索。几elasto塑料的静态的闲差事分析在这个有限元素模型上被执行。分析结果显示地震能力(或供应)当时，基础处于最糟的条件预言的最深全球的侦察深度被到达，并且当时，能力变得更大本地人搜索深度在预言的最深全球的侦察深度下面。因此，评估一个基础的地震能力，仅仅预言的最深全球的侦察深度应该被考虑。在这份报纸使用的方法能也与另外的土壤类型被用于基础。

简介：Adynamicmodeltest(CL=4)atdifferentvelocitiesoftrain,namelydifferentloadingfrequencies,iscarriedouttostudythedynamiccharacteristicsofahigh-speedrailwaytunnelinvertanditsfoundationsoils.Notonlyaretheaccelerations,dynamiccoefficients,dynamicstressesoftheinvertandfoundationsoilsemphaticallyanalyzed,theirrelationshipwiththevelocityofthetrainarediscussedindetail.Throughlaboratorytesting,theattenuationofvibrationpropagatingfromuptherailsisobtainedandthecalculationformulaofthespeedinfluencecoefficientofthetunnelinvertispreliminarilyestablished.Thedepthofthefoundationsoilsinfluencedbyvibrationisalsodeterminedinthisstudy.Itisshownthattheresponsesofthetunnelinvertandfoundationsoilstovibrationareslightlyincreasedwiththevelocityofthetrain;circumferentialstressesinthebottomoftheinvertaretensilestressesandmaximumstressesappearunderthefootoftherails;thedynamicsoilpressuresofthefoundationdecreasequicklywiththedistanceawayfromthetunnelinvertandanexponentialrelationshipexistsbetweenthem.

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简介：structure-foundation-soil的考虑动态相互作用是在原子力量设备的地震安全的评估的一个基本要求。一个有效、精确的动态相互作用在时间领域的数字模型成为了当前的研究的一个重要话题。在这研究，放大边界有限元素方法(SBFEM)与好申请前景用作一条有效数字途径被改进。这个方法有几个优点，包括维数减小，光线的分析答案的精确性，和不同其它边界元素方法，它不要求一个基本答案。这研究集中于证实高效放大了边界在时间领域的有限元素相互作用分析模型基于加速单位推动反应矩阵，在哪个几种新溶液技术，例如一个无尺寸的方法到解决相互作用力量，被使用改进实际土壤参数的数字稳定性并且减少计算的数量。最后，领域方法被原子力量结构和算法的精确性的反应说明的时间的可行性被比较动态地与一个大规模粘弹性的土壤模型的精炼验证。

简介：Thesignificanceofdetectionofurbanactivefaultsandthegeneralsituationconcerningdetectionofurbanactivefaultsintheworldarebrieflyintroduced.Inabriefdescriptionofthebasicprinciplesofanti-disturbanceandhigh-resolutionshallowseismicexploration,thestressisputontheexcitationofseismicsources,theperformanceofdigitalseismographs,receivingmodeandconditions,geometryaswellasdataacquisition,processingandinterpretationintheanti-disturbanceandhigh-resolutionshallowseismicexplorationofurbanactivefaults.Thestudyindicatesthatacontrolledseismicsourcewithalinearornonlinearfrequency-conversionscanningfunctionandtherelevantseismographsmustbeusedindataacquisition,aswellasworkingmethodsforsmallgroupinterval,smalloffset,multi-channelreceiving,short-arrayandhigh-frequencydetectorsforreceivingareused.Attentionshouldbepaidtotheapplicationoftechniquesforstaticcorrectionofrefraction,noisesuppressing,high-precisionanalysisofvelocity,waveletcompressing,zero-phasingofwaveletandpre-stackingmigrationtodataprocessingandinterpretation.Finally,somecasesofanti-disturbanceandhigh-resolutionshallowseismicexplorationofurbanactivefaultsarepresentinthepaper.

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简介：根据理论分析，扎根的颤动的一个一般特征由高水坝洪水分泌物导致了是主导的频率在几个狭窄的频率乐队上变化，它被观察从Xiangjiaba水力发出的电力车站验证。非线性的基础隔离被用来在地面刺激下面减少结构颤动，隔离应用程序的优点是低频率的回声问题不需要由于它的刺激特征被考虑，它显著地便于隔离设计。以便获得反应一个非线性的系统的概率的分发，州的空间裂口技术被修改。当仅仅自由的一些度受到随机的噪音，没有包含随机的刺激的反应的概率的分发被功能代表。然后，功能的采样性质被采用减少Fokker-Planck-Kolmogorov(FPK)方程的尺寸，低维的FPK方程与存在方法是可解决的。数字结果显示建议途径有效、精确。而且，反应概率的分布比到常规时间和频率领域方法计算的山峰回答更合理、科学。

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简介：High-velocityfrictionexperimentswereconductedonclayeyfaultgougecollectedfromHongkououtcropofBeichuanfault,locatedatthesouthwesternpartofLongmenshanfaultsystemthatcausedthedisastrous2008Wenchuanearthquake.Theultimatepurposeofthisstudyistoreproducethisearthquakebymodelingbasedonmeasuredfrictionalproperties.Drygougeofabout1mminthicknesswasdeformeddryatslipratesof0.01to1.3m/sandatnormalstressesof0.61to3.04MPa,usingarotary-shearhigh-velocityfrictionaltestingmachine.Thegougedisplaysslipweakeningbehaviorasinitialpeakfrictiondecaystowardssteady-statevaluesafteragivendisplacement.Bothpeakfrictionandsteady-statefrictionremainhighatslowslipratesareexaminedandgougeonlyexhibitsdramaticweakeningathighsliprates,withsteady-statefrictioncoefficientvaluesofabout0.1to0.2.Specificfractureenergyrangesfrom1to4MN/minourresultsandthisisofthesameorderasseismicallydeterminedvalues.LowfrictioncoefficientsmeasuredonexperimentalfaultsareinbroadagreementwithlackofthermalanomalyobservedfromtemperaturemeasurementsinWFSD-1drillhole(WenchuanEarthquakeFaultScientificDrillingProject),whichcanbeexplainedbyevensmallerfrictioncoefficientfortheWenchuanearthquakefault.High-velocityfrictionexperimentswithporewaterneedstobedonetoseeifevensmallerfrictionisattainedornot.Shinyslickensidesurfacesformathighsliprates,butnotatslowsliprates.Slipzonewithslickensidesurfacechangesitscolortodarkbrownandformsduplex-likemicrostructures,whicharesimilartothosemicrostructuresfoundinthefaultgougesfromtheHongkououtcrop.DetailedcomparisonsbetweenexperimentallydeformedgougesamplesandWFSDdrillcoresinthefuturewillrevealhowmuchwecouldreproducethedynamicweakeningprocessesinoperationinfaultzonesduringWenchuanearthquakeatpresent.

简介：当时，本地联合不稳定性将发生吸收边界状况和地波浪方程的数字计划允许精力自发地进入计算领域。也就是说，二个计划支持普通波浪解决方案，组速度指了进计算域。消除联合不稳定性的本地人的钥匙是避免如此的波浪答案。为块团在2D波导的P-SV波浪运动的有限元素模拟，为高顺序的稳定的实现的一条途径多播送的公式被提供。与一个一致矩形的网孔，它被证明并且验证那高周波的本地联合不稳定性能被设置等于或比\大的元素尺寸的比率消除(\sqrt2\)乘到S波浪速度的P波浪速度的比率。这些结果能为发另外的吸收边界条件导致的不稳定性问题是珍贵的。