简介：Thispaperpresentsalaboratorystudyonbridgepierprotectionwithsurfaceguidepanels(SGP)inclear-waterexperiments.TheSGPisinstalledbypiercingasetoftwoverticalpanelspartiallyintothewater,withsomeinteriorangleandleadingopening,settingatadistanceaheadoftheprotectedpier.ThesuitableinstallationoftheSGPcaneffectivelyadjusttheflowpatterntoreducethedownflowmotionandthehorseshoevortexaheadofthepier.WeconsidersomedominantfactorstosetupSGPforpierprotection,includingtheinteriorangleθ,leadingopeningOw,distancebetweenpanelandpierL,submergeddepthofpanelPd,pierdiameterDandwaterdepthH.Afterevaluationoftheseparametersthroughlaboratorytests,theoptimalsetupconditionsofθ=60o,Ow/D=0.1～0.2,L/D=2～2.5andPd/H=0.7aredetermined.Undertheseconditions,theusageofSGPleadstoabestperformanceondecrementofthemaximumscourdepthatpierupto90%withignorablesideeffectsontheSGPscour.

简介：Basedonthe1stordercnoidalwavetheory,thewavediffractionaroundthepiergroupinshallowwaterisstudiedinthispaper.Theformulasforcalculatingthenonlinearwaveforcesarealsopresentedhere.Inordertoverifythetheoreticalresults,modeltestsareconductedinthewaveflumeinTheStateKeyLaboratoryofCoastalandOffshoreEngineeringlocatedinDalianUniversityofTechnology.TherangeofthewaveparametersintheexperimentsischaracteristicwaveperiodTg/d1/2=8.08-22.86,characteristicwaveheightH/d=0.10.45.Theresultsobtainedfromtheexperimentsagreewiththetheoreticalresultsquitewell.Itisshownthat,inshallowwaterthenonlinearwaveforcesactingonapiergrouparegreaterthanthosecalculatedbylinearwavetheory,thevalueofincrementinwaveforceincreaseswiththeincreasesofthenonlinearityofthewave.Inthewaverangestudiedinthispaper,thenonlinearwaveforcecanreachover4timestheforcecalculatecdbylinearwavetheory.Thus,itissuggestedthat,whenTg/d1/2>8,thewaveforceonthepiersinthepiergroupinshallowwatershouldbecalculatedbyusingthecnoidalwavetheory.

简介：-Generallythetoeofthebankslopeinfrontofthepile-supportedpierhastobedredgedtomeettherequirementsofwaterdepthfortheberthofships,whilethetopoftheslopeinrearofthepiermustbebackfilledandelevatedtomakeconnectionswithlandtransportation.Thenthenaturalstateofequilibriumoftheslopeisdestroyed,andsomedeformationanddisplacementareunavoidablyinducedinthesoilmasswhichwillexertanundesirableinfluenceonthepilefoundationofthepier.Thisisatypicalproblemoftheinteractionbetweentheso-called"passivepile"andsurroundingsoil,andhasbeenscarcelystudiedintheliteratureofgeotechnicalengineering.Inthispaper,fieldobservation,modeltestsandnumericalanalysisconductedbytheauthorstostudytheinteractionbetweenpile-supportedpierandbankslopearebrieflydescribedandsomepreliminaryresultsarepresented.

简介：Mobileoffshoredouble-causewaypiersystem,atypeofseashoreunloadingequipment,consistsoftwogroupsofmultipleconnectedsemi-submersiblemodules.Thisstructurehaswideapplicationbecausemostofthemiddleorminitypeofvesselsandshipscanbemooredtoit.Basedontheanalysisofcomputationalmethodsofmulti-bodymotionresponse,ahydrodynamicmodelissetupandthethree-dimensionalpotentialtheoryinfinitedepthisadoptedtocalculatethethree-dimensionalmotionresponseofthissystem.ThedoubleP-Mspectrumisusedtoanalyzethemotionresponseinirregularwaves.Differentwavedirectionsarespeciallytakenintoconsideration,duetotheirvariouseffectstothemotionresponse.Furthermore,thecalculatedresultiscomparedwiththatoftheexperiment,anditisprovedthatsway,heave,pitchandyawmotionaregreatlyconstrainedbymooringsystem.Thecomparisonalsoindicatesthatthemodelcanforecastthemotionperformanceofthetarget,andthatthecalculatedresultcanalsobeusedasreferenceinconnectorandmooringsystemdesign.

简介：Sincelocalscouratbridgepiersinriversandestuariesisamajorcauseofbridgefailure,estimationofthemaximumlocalscourdepthisofgreatimportancetohydraulicandcoastalengineers.Althoughnumerousstudiesthatfocusonscour-depthpredictionhavebeendoneandpublished,understandingoftheflowandturbulencecharacteristicsofthehorseshoevortexthatdrivesthescourmechanisminadevelopingscourholestillisimmature.Thisstudyaimstoquantifythedetailedturbulentflowfieldinadevelopingclear-waterscourholeatacircularpierusingParticleImageVelocimetry(PIV).Thedistributionsofvelocityfields,turbulenceintensities,andReynoldsshearstressesofthehorseshoevortexthatforminfrontofthepieratdifferentscourstages(t=0,0.5,1,12,24,and48h)arepresentedinthispaper.Duringscourdevelopment,thehorseshoevortexsystemwasfoundtoevolvefromoneinitiallysmallvortextothreevortices.Thestrengthandsizeofthemainvortexarefoundtoincreasewithincreasingscourdepth.TheregionsofboththemaximumturbulenceintensityandReynoldsshearstressarefoundtoformatalocationupstreamofthemainvortex,wherethelargeturbulenteddieshavethehighestpossibilityofoccurrence.Resultsfromthisstudynotonlyprovidenewinsightintothecomplexflow-sedimentinteractionatbridgepiers,butalsoprovidevaluableexperimentaldatabasesforadvancednumericalsimulations.

简介：到控制的各种各样的方法在桥牌附近搜索墩被建议了。在现在的学习，电报或领子和领子的应用程序试验性地被检验，作为对在光滑的圆形的桥墩的本地搜索的反措施，近到一致沉积运动的开始的阀值流动条件。结果证明电报和领子的同时的使用在减少scour深度有高效率。最好的配置被作出对有利的裁决0.15的电缆线码头直径比率和15的线角度???????????????????????六?栠摹潲潬楧??????????吗？？

简介：Two-andthree-dimensionalfiniteelementanalysisprogramsforpile-soilinteractionarecompiled.Duncan-Chang'sModelisused.Theconstructionsequenceofthepierismodeled.Thepile-soilinterfaceelementisused.Theinfluenceofthecombinationtypeofpilesonthedeformationofbankslopeandpilebehaviourisanalyzed.Differentdesignsofapile-supportedpierarecomparedthoroughly.Calculationresultsshowthatthestressesanddisplacementsofthepilearedirectlyrelatedtothedistancefromthebankslopeandthedirectionofinclination.Aninclinedproppilesetintherearplatformwouldremarkablyreducethestressesofpilesandthedisplacementofthepier.

简介：Thepier,placedattheoutletofthepressureflowsection,isaneffectivedesigntodealwiththeproblemsofthemanufactureandoperationofthegatesforadischargetunnelwithhighwaterhead.Itiscrucialtocontrolthewater-wing,inducedbythistypeofthepier.Throughobservingthephenomenaofthewater-wing,thereasonofthewater-winginception,i.e.,theconcaveoftheflowsurface,waspresented,andatypeofthenewpierwithbottomunderlaywasdesigned.Thehydrauliccharacteristicsofthepier,includingthevariationsofthewater-wingfeatures,bothlengthandheight,withthewaterhead,aswellaswiththeconcavedepth,andwiththeheightofthebottomunderlay,andthevariationsoftheconcavedepthwiththeheightofthebottomunderlay,wereinvestigatedbyphysicalmodelexperiments.Theresultsshowthattheapproachofthemodificationoftheconcavethroughthestructureswiththebottomunderlay-typepierisremarkablyeffectiveinthewater-wingcontrol.

简介：Inthisstudy,avariationalapproachtothesettlementanalysisofanaxiallyloadedpierem-beddedinamulti-layeredsoilprofileispresented.Inthismethod,thesoilprofileandtheembeddedpieraredividedintoanumberofsub-layersaccordingtotheactualnumberofsoillayersobservedinthefield.ThedisplacementshapefunctionofeachsoillayerisgivenasaproductofanexponentialequationalongthepierdepthandtheBessel’ssolutionintheradialdirection.Thedisplacementrelationshipamongthelayerscanbederivedthroughthetransformationmatrices.Oneofthemajorfeaturesofthismethodisthatthetotalnumberofpierelementsisthesameasthatofsoilsub-layers.Allthefieldcompontents,suchasthedisplacement,stress,andstraininthesoil,canbecalculatedbyclosed-formsolutionsexceptthattheonlyunknownvari-ableisthevalueβwhichcanbedeterminedbyiterationtechniques.Comparisonsweremadewiththeresultsoffiniteelementanalysisandthefieldobservationinpile-loadedtests.

简介：作为生物识别技术重要手段之一的虹膜技术．因其高度的准确性及无需进行人体接触等特点．逐渐在国内外得到广泛应用。L1—ID公司的PIER—T^TM便携式虹膜登记及识别设备是经久耐用、成本效益好的虹膜数据采集识别系统，使操作者可利用高度独特的人类虹膜样式和纹理进行人员登记和识别。根据该设备的设计，在操作时可连接主机电脑或笔记本电脑。

简介：在世界的许多区域，一座桥将在它的期望的服务生活期间经历多重极端危险。州的高速公路和交通官员(AASHTO)的当前的美国协会负担和电阻因素设计(LRFD)说明基于失败可能性被提出，它充分现场为死了的负担和nonextreme被校准负担。对地震负担的设计独立被建立。设计对搜索效果被使用能力减小的概念也独立提出(或增加搜索深度)。而且，搜索效果不能直接被连接到一个LRFD限制状态方程，因为后者用基于力量的分析被提出。这份报纸(在二部分)介绍一个基于概率的过程由于卡车在桥上估计联合危险效果，地震并且搜索，由对待效果作为相等的负担效果搜索以便它能在基于可靠性的桥失败计算被包括。部分地我这个系列，把scour深度当作相等的负担效果的一般原则被介绍。单个、联合的部分失败可能性由于卡车，地震并且搜索效果被描述。为了解释包括non-force-based天赋危险的方法，完成，二种类型普通搜索失败被考虑。在第二部分，相应的桥失败概率，出现象同时让卡车负担和等价物搜索负担一样搜索份量上被讨论。

简介：在世界的许多区域，一座桥将在它的期望的服务生活期间经历多重极端危险。州的高速公路和交通官员(AASHTO)的当前的美国协会负担和电阻因素设计(LRFD)说明基于失败可能性被提出，它充分为死了的负担和非极端的实时负担被校准。对地震负担效果的设计独立被建立。设计对搜索效果被使用能力减小的概念也独立提出(或增加搜索深度)。而且，搜索效果因为后者用基于力量的分析被提出，不能直接被连接到一个LRFD限制状态方程。这份报纸(在二部分)介绍一个基于概率的过程由于卡车在桥上估计联合危险效果，地震并且搜索，由对待效果作为相等的负担效果搜索以便它能在基于可靠性的失败计算被包括。部分地我这个系列，为把scour深度当作相等的负担效果的一般原则被介绍。在第二部分，相应的桥失败概率，出现象同时让卡车负担和等价物搜索负担效果一样搜索份量上被讨论。有条件的部分失败可能性和必要条件的关键公式被建立。以便说明方法论，死者的一个例子，卡车，地震并且在一个简单的桥堆积基础上搜索效果被代表。