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外文翻译--用于吸力式基础离心机模拟的动力加载设备 英文版.pdf

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外文翻译--用于吸力式基础离心机模拟的动力加载设备 英文版.pdf

第21卷第4期2006年8月实验力学JOURNALOFEXPERIMENTALMECHANICSVOL21NO4AUG2006文章编号10012488820060420439208ADYNAMICLOADINGDEVICEFORSUCTIONFOUNDATIONSINCENTRIFUGEMODELING3WANGSHU2YUN1,ZHANGJIAN2HONG2,LUXIAO2BING331,JIAOBIN2TIAN11INSTITUTEOFMECHANICS,CHINAACADEMYOFSCIENCE,BEIJING100080,CHINA;2DEPARTMENTOFHYDRAULICENGINEERING,TSINGHUAUNIVERSITY,BEIJING100084,CHINAABSTRACTSUCTIONBUCKETFOUNDATIONSAREWIDELYUSEDINTHEOFFSHOREPLATFORMFORTHEEXPLOITATIONOFTHEOFFSHOREPETROLEUMANDNATURALGASRESOURCESDURINGWINTERSEASONS,ICESHEETSFORMEDINBOHAIBAYWILLIMPOSESTRONGIMPACTANDRESULTINSTRONGVIBRATIONONTHEPLATFORMTHISPAPERDESCRIBESADYNAMICLOADINGDEVICEDEVELOPEDONTHEGEOTECHNICALCENTRIFUGEANDITSAPPLICATIONINMODELINGSUCTIONBUCKETFOUNDATIONUNDERTHEEQUIVALENTICE2INDUCEDVIBRATIONLOADINGSSOMEEXPERIMENTALRESULTSAREPRESENTEDITISSHOWNTHATWHENTHELOADINGAMPLITUDEISOVERACRITICALVALUE,THESANDATTHEUPPERPARTAROUNDTHEBUCKETSOFTENSOREVENLIQUEFIESTHEEXCESSPOREPRESSUREDECREASESFROMTHEUPPERPARTTOTHELOWERPARTOFTHESANDFOUNDATIONINVERTICALDIRECTIONWHILEDECREASESFROMNEARTOFARAWAYFROMTHEBUCKET′SSIDEWALLINTHEHORIZONTALDIRECTIONLARGESETTLEMENTSOFTHEBUCKETANDTHESANDAROUNDTHEBUCKETOCCURUNDERTHEHORIZONTALDYNAMICLOADINGTHEDYNAMICRESPONSESOFTHEBUCKETWITHSMALLERSIZEAREHEAVIERKEYWORDSSUCTIONBUCKETFOUNDATION;DYNAMICLOADINGDEVICE;ICE2INDUCEDVIBRATION;CENTRIFUGEMODELING0INTRODUCTIONINRECENTYEARS,SUCTIONBUCKETFOUNDATIONSHAVEBEENAPPLIEDINCREASINGLYOFTENINOFFSHOREENGINEERINGCLUKEYETAL1,1995;ALLERSMAETAL2,3,1997,2000THEFIRSTADVANTAGEOFSUCTIONBUCKETFOUNDATIONSAREATTRACTIVEBECAUSEOFTHECONVENIENTMETHODOFINSTALLATIONANDREPEATEDLYUSEFORANEXAMPLE,ASUCTIONBUCKETFOUNDATIONWITHADIAMETEROF9MANDAHEIGHTOF10MCANBEINSTALLEDIN1~3HOURS,BYUSINGONLYAPUMPTHESECONDADVANTAGEISTHATITMAYMOBILIZEASIGNIFICANTAMOUNTOFPASSIVESUCTIONDURINGUPLIFTDESPITESEVERALSTUDIESONTHEINSTALLATIONANDSTATICBEARINGCAPACITYHAVEBEENCARRIEDOUT,THEDETAILRESPONSESOFSUCTIONBUCKETFOUNDATIONSUNDERDYNAMICLOADINGSHAVEREMAINEDUNKNOWNSENPEREETAL4,1982;AASETAL5,1992;DYMEETAL6,1998THEDYNAMICLOADINGCONDITIONISSIGNIFICANTWHENSUCTIONBUCKETSAREUSEDASTHEFOUNDATIONOFAPLATFORMWAVELOADINGANDICE2INDUCEDDYNAMICLOADINGCAUSETHEFOUNDATIONTOBESUBJECTEDTOCYCLICLOADINGSTJELTAETAL7,1990;BYEETAL8,1995THELACKOFEXPERIENCESUNDERTHESELOADING333收稿日期2005208224;修订日期2006207210基金项目THISPROGRAMISSUPPORTEDBYTHEFUNDOFCHINESEOCEANOILCOANDCHINESEACADEMYOFSCIENCESKJCX22SW2L0320140025103ANDNATIONALNATURALSCIENCEFUNDNO10202024通讯作者鲁晓兵1968,男,博士,现在中科院力学所从事岩土力学研究。E2MAILXBLUIMECHACCNCONDITIONSLEDTOAPROPOSALFORATESTPROGRAMINTENDEDTOGAINADEEPERUNDERSTANDINGTHECONSIDERABLEEXPENSEANDTIMECONSUMINGNATUREOFPROTOTYPETESTSMEANTHATTHEINVESTIGATIONOFTHEBEARINGCAPACITYOFREALSCALEDEVICESUNDERDIFFERENTCIRCUMSTANCESISOFLIMITEDPRACTICALITYITISMUCHEASIERTOCHANGEPARAMETERSINSMALLSCALETESTSBUTPROBLEMSARISECONCERNINGTHESTRESS2DEPENDENTBEHAVIOROFSOILTHATTHEMEASUREDLOADINGSARESOLOWTHATMEASUREMENTSARENOTSUFFICIENTLYACCURATETOVISUALIZEDIFFERENCESINDESIGNTHESERESTRICTIONSCANBEOVERCOMEIFPERFORMINGTHETESTSINAGEOTECHNICALCENTRIFUGEINACENTRIFUGETHESOILSTRESSESOVERASIMILARDEPTHARETHESAMEASINTHEPROTOTYPESITUATIONFORANEXAMPLE,AT100G100TIMESTHEEARTH′SGRAVITY,ASUCTIONFOUNDATIONWITHADIAMETER9MANDAHEIGHTOF9MMAYBESIMULATEDWITHAFOUNDATIONWITHADIAMETEROF009MANDAHEIGHTOF009MTHESCALINGFACTOROFTHEPROTOTYPETOTHEMODELIS100∶1THEICE2INDUCEDDYNAMICLOADINGISTHECONTROLLINGLOADINGINBOHAIBAYINCHINATHISTYPEOFHORIZONTALDYNAMICLOADINGISTRANSLATEDTOTHESOILLAYERBYPLATFORMANDCAUSESTHEPARAMETERS,EGSTRENGTHANDMODULUSOFTHESOILLAYER,TODEGRADEASARESULT,THEBEARINGCAPACITYOFBUCKETFOUNDATIONSDECREASESTHEREFORE,ITISIMPORTANTANDNECESSARYTOCLARIFYTHEDYNAMICBEHAVIOROFBUCKETFOUNDATIONSUNDERTHISTYPEOFLOADINGSINORDERTOPROVIDEPRACTICALDESIGNMETHODANDPARAMETERSDINGETAL9,2003;LUETAL10,2003INTHISPAPER,WEFIRSTINTRODUCEDASETOFDYNAMICLOADINGDEVICESDESIGNEDFORSIMULATINGTHEHORIZONTALDYNAMICLOADINGSTHENSOMEEXPERIMENTALRESULTSOFTHEICE2INDUCEDCYCLICBEHAVIOROFSUCTIONBUCKETFOUNDATIONSAREPRESENTEDTHEEFFECTSOFTHELOADINGAMPLITUDE,THESIZEOFTHEBUCKETANDTHESTRUCTURALWEIGHTAREMAINLYINVESTIGATEDFIG1THEELECTRO2MAGNETICACTUATOR1DYNAMICLOADINGDEVICETHEDYNAMICLOADINGDEVICEISCOMPOSEDPRIMARILYOFANELECTRO2MAGNETICACTUATORASSHOWNINFIG1THISACTUATORCONSISTSOFAPERMANENTMAGNET,ACYLINDRICALSILVERCOIL,TWOCOPPERDISKSPRINGS,ALOADCELLANDASTEELRODCONNECTEDTOTHECOILTHEREARETWOMAINTECHNICALCHALLENGESASSOCIATEDWITHTHEDESIGNOFTHEACTUATOR1THECYLINDRICALCOILISSUSPENDEDINAPREFABRICATEDSPACEINTHEPERMANENTMAGNETTHESPACEISVERYTINYINORDERTOAVOIDMAGNETICLOSSHOWEVER,SINCETHISCYLINDRICALCOILMOVESHORIZONTALLY,ITISORTHOGONALTOTHEGRAVITATIONALFORCE,THEDEFORMATIONOFTHECOILUNDERTHISGRAVITYMAYLOCKITINTHISTINYSPACEINORDERTOAVOIDTHISSITUATIONALINEARBEARINGANDTWODISKSPRINGSAREINSTALLEDTOMAKETHECOILMOVELINEARLYWITHOUTBEINGLOCKEDTHISTECHNIQUEHASBEENDEMONSTRATEDTOBEVERYEFFECTIVE2THEWEIGHTOFTHECOILSHOULDBEMINIMIZEDTOINCREASEITSDEFORMATIONINTHEDIRECTIONOFLOADINGSILVERWIREISUSEDTOFORMTHECYLINDRICALCOILSOASTOENHANCETHEPERFORMANCEANDLIMITTHEWEIGHTWITHIN05KGTHETOTALWEIGHT044实验力学2006年第21卷OFTHEDEVICEIS14KGCONSEQUENTLY,THEVIBRATIONOFTHE05KGCOILWOULDNOTIMPOSESIGNIFICANTIMPACTONTHESTRONGBOXWHOSEWEIGHTIS150KGTHECOILMOVESBACKANDFORTHTOAPPLYCYCLICLOADINGONTHEMODELBUCKETTHROUGHARIGIDRODFIG2ISTHECONTROLLINGSYSTEMFORTHELOADINGDEVICETHELOADINGFUNCTIONISFEDFROMACOMPUTERSIGNALGENERATORINTOASERVOAMPLIFIERTHELATTERINTURNGENERATESTHENECESSARYELECTRICALSIGNALSTOCONTROLTHEINTENSITYOFELECTRICCURRENTINTHEACTUATORTHEOUTPUTFROMTHEACTUATORINTHEFORMOFLOADINGISCONTINUOUSLYMONITOREDBYTHELOADINGCELLANDFEDBACKTHROUGHACHARGEDAMPLIFIERTOTHEOSCILLOGRAPHOUTPUTSIGNALFROMPOREPRESSURETRANSDUCERPPTANDLINEARVARIABLEDISPLACEMENTTRANSFORMERSLVDTWEREPASSEDACROSSTHECENTRIFUGESLIP2RINGANDCONVERTEDTODIGITALDATAWITHTHISDEVICE,DIFFERENTAMPLITUDESANDTHEFREQUENCIESOFHORIZONTALCYCLICFORCESAREREPRODUCEDATCENTRIFUGALACCELERATIONOF80GTHEREFORE,THESCALINGFACTOROFTHELOADFREQUENCYOFTHEPROTOTYPETOTHEMODELIS1∶80,ANDTHESCALINGFACTOROFTHELOADAMPLITUDEOFTHEPROTOTYPETOTHEMODELIS6400∶1INTHECENTRIFUGE,THEPEAKCYCLICLOADINGOF100NAND64HZREPRESENTSAPROTOTYPELOADINGOF640KNAND08HZTABLE1SHOWSTHETECHNICALSPECIFICATIONSOFTHISACTUATORTHEFORCE2ELECTRICITYRELATIONAT80GISSHOWNINFIG3TAB1TECHNICALSPECIFICATIONOFTHEELECTROMAGNETICACTUATORDIAMETERMMLENGTHMMWEIGHTKGFREQUENCYRANGEHZPEAKCYCLICLOADN180260141~1201002CENTRIFUGESYSTEMCONFIGURATIONFIG4SHOWSTHECONFIGURATIONOFTHECENTRIFUGEANDTHEMODELTHEINTERNALAREAOFTHEALUMINUMSTRONGBOXMEASURES600MM350MMANDHEIGHTIS350MMTHETHICKNESSOFTHESILTYSANDIS210MM,UNDERLAINBY20MMCOARSESANDWHICHISTOPREVENTTHEPIPINGDURINGPENETRATIONOFWATERTHEREIS20MMHIGHWATERABOVETHESOILSURFACETHEACTUATORISSUPPORTEDBYTWOSTEELBEAMSFASTENEDONTHEFLANGETWORODSFIXTHEBACKOFTHEACTUATORAGAINSTTHESIDEOFTHESTRONGBOXASSHOWNINFIG4AMINIATURETVCAMERAWASATTACHEDTOTHEFLANGEOFTHEMODELCONTAINERTOMONITORTHEMOTIONOFTHEMODELBUCKETTHEMODELBUCKETISASTEELCYLINDERWHICHHASANEXTERNALDIAMETEROF60MM,ANINTERNALDIAMETEROF56MM,ANDAHEIGHTOF72MMTHEDEADWEIGHTOFTHEPLATFORMWASSIMULATEDBYABALLASTMOUNTEDONTHETOPOFTHESHAFTTHEMOVEMENTOFTHEBUCKETWASMONITOREDBYTWOLVDTSWHENTHECENTRIFUGEMODELISTESTEDUNDER80G,ITSBEHAVIORWOULDPRIMARILYCORRESPONDTOTHATOFAPROTOTYPEFOOTINGWITHADIAMETEROF48M144第4期WANGSHU2YUNETALADYNAMICLOADINGDEVICEFORSUCTIONFOUNDATIONSINCENTRIFUGEMODELINGFIG4THELAYOUTOFTHEMODEL3PREPARATIONOFTHEEXPERIMENTSTHEEXPERIMENTSAREPERFORMEDINTHE50G2TONSCENTRIFUGEINTSINGHUAUNIVERSITYTHEMAXIMUMOFTHECENTRIFUGE′SACCELERATIONIS200GTHEPAYLOADIS250KGUNDER200GTHEEXPERIMENTALMATERIALISFINESANDWHOSESPECIALGRAVITYIS269ANDTHEAVERAGEGRAINSDIAMETERIS014MMTHEPERMEABILITYIS5103MM/STHREEMODELBUCKETSMADEBYSTEELAREUSEDINEXPERIMENTSTHEINNERDEPTHSDONOTINCLUDETHETOPCAPTHICKNESSARE48MM,72MMAND90MM,RESPECTIVELY,THEINNERDIAMETERSAREALL60MM,THETHICKNESSESOFTHEWALLANDTHETOPCAPAREBOTH2MMAFINEPIPEWITHANOUTERDIAMETEROF10MM,ANINNERDIAMETEROF8MMANDAHEIGHTOF100MMISWELDEDATTHECENTEROFTHETOPCAPASLIDINGGROOVEPERMITTINGABALLMOVINGUPANDDOWNTOADAPTTHESETTLEMENTOFTHEBUCKETISCONNECTEDWITHTHEPIPECLOSELYONEENDOFASTEELPOLEISJOINTEDWITHABALL,THEOTHERENDOFTHEPOLEISCONNECTEDWITHTHEELECTROMAGNETICVIBRATIONACTUATORTHUSTHEPOLECANNOTBEDRAGGEDWHENTHEBUCKETSETTLESONELVDTISLOCATEDATTHETOPOFTHEFINEPIPETOMEASURETHEVERTICALDISPLACEMENTONELVDTISLOCATEDATTHEFINEPIPEATTHESAMELEVELASTHATOFTHESTEELPOLETOMEASURETHEHORIZONTALDISPLACEMENTTHEOTHERTWOLVDTSARELOCATEDONTHESANDSURFACETOMEASURETHESETTLEMENTSOFTHESANDSURFACEATDIFFERENTPOSITIONSTENPPTSMADEINDRUCKCOENGLISH,AREBURIEDINTHESANDAROUNDANDINTHEBUCKETFIG5THEPPTSARENOTFIXEDBUTSUSPENDEDINTHESANDINORDERTOGUARANTEETHEREPEATABILITY,210MMTHICKMODELSANDLAYERISDIVIDEDINTOFIVELAYERSTOCREATEANDBECOMPACTEDGENTLYBYHANDSTRIKINGTHISCOURSEISCONTROLLEDBYDRYDENSITYTHEWATERDEPTHOVERTHESANDSURFACEIS1CMAFTERTHEDRYSANDSAMPLEHASBEENPREPARED,THESANDLAYERISSATURATEDBYPENETRATINGWATERINTOFROMTHEBOTTOMOFTHETANKTHROUGHAVULVAA20MMTHICKCOARSESANDLAYERISDEPOSITEDATTHEBOTTOMOFTHETANKTOGUARANTEETHEWATERRISEUNIFORMLYANDPREVENTINGTHEPIPINGWHENTHEWATERLEVELISOVERTHESANDSURFACE,AVACUUMPUMPISUSEDTOPUMPTHEGASINTHESANDFOR38HOURSTOINCREASETHESATURATIONTWOTYPESOFPPTLAYOUTAREADOPTEDINTHETESTSTHEFIRSTTYPEONEROWPPTSAREDISPOSEDINTHESANDALONGDEPTHATTHEACTUATORSIDEAND2MMAWAYFROMTHEBUCKET′SSIDEWALLTHEUPPERONEIS20MMBELOWTHESANDSURFACETHEOTHERSHAVEA20MMDISTANCEONEBYONEFROMTHEUPPERTOTHELOWESTTWOROWSAREDISPOSEDINTHESANDATTHEOPPOSITESIDEONEROWIS2MMAWAYFROMTHEBUCKET′SWALLANDTHEOTHERROWIS52MMAWAYFROMTHEBUCKET′SWALLTHESECONDTYPETWOROWSAREBOTH2MMAWAYFROMTHEBUCKET′SSIDEWALLONTHEOPPOSITESIDEINTHELOADINGDIRECTIONAROWOFPPTSAREDISPOSEDINTHEHORIZONTALDIRECTION20MMBELOWTHESANDSURFACEEXCEPTFORTHEPPTS244实验力学2006年第21卷

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