High-performance Abaqus simulations in soil mechanics.docx

High-performanceAbaqussimulationsinsoilmechanics2008baqsUsersConference11modelledinathree-dimensionalsoi1continuumconsistingof69401finiteelements,78179nodesandaltogether234543d.o.f.s,seeFigure7a.Almostoptimalefficiencycouldbereachedwithbaqus6.6withupto16processorsusingthedonainleveldecompositionalgorithm.TheresultsconcerningthechangesinthestatevariablesofthesurroundingsoilcanbefoundinHenkeandGrabe(2006).Thispublicationalsodiscussestheeffectsofdrivingapileinthecenterofanexistingpilegroup.Figure7.Abaqusmodelforsimulationofpiledrivingintosubsoil.4.4OptimizationofaquaywallconstructionusingAbaqUS/StandardandMT1.Bquaywal1witharathersimplecombinedsheetpiIewallisregardedasshowninFigure9.Thedesignofsuchsheetpilewal1constructionsisamultipurposeoptimizationprocess.Clearlydefinedrequirementsontheconstructionarefacedwithapluralityofpossiblevarietiesofstaticsystems.Highlyreduced,theconstructionprocessiscomposedofthedeterminationofanchor-andsheet-pile-profileaswellaschoiceoftheanchorinclinationandthegradeofrestraintprovidedbythesoil.TheobjectivesarethetonnageofsteelwhichisrelatedtothetotalconstructioncostsandthehorizontaldeformationofthesheetpileheadasaparameterfortheServiccabilityoftheconstruction.safirststepintheanalysistheconventionalverificationsforachosensetofparametersareenforced.Thetonnageresultsdirectlyfromthestressanalysisintheultimatelimitstate.122008AbaqusUsersConferenceFigure8.MeasuredspeedupforAbaqusjobsrunningonSMParchitectures.Figure9.Quaywallconstructiontobeoptimized.Foramorerealisticsurveyofthesoi!-structureinteractionandthedeformationbehaviourthehorizontaldeformationofthepileheadiscalculatedbyAbaqus.Thereforeaparameterized,easymodifyingmodelisgenerated.Themodelisseparatedintoregionswhicharedeterminedbydi-mensionschosenbytheoptimizationalgorithm.regularmesh,controlledbyauserspecifiedglobalelementsize,isgenerated,seeFigure10.Theintermediatestepsoftheconstructionprocessaremodelledaswe11.A1valuesdependonfractionsoftheconstructiveheightofthequaywall.Inadditiontothedimensionstheprofilesarevariedbychoosingdifferentmaterialparametersforthe13anchorstiffnesskandthemomentofinertiaIaswellasthecross-sectionareaAofthesheetpilewall.Toallowasmartperformanceoftheoptimization,itisnecessarytogenerateameshyieldingmoderatewallclocktimes.Formercalculationsindicatethatanumberofapproximately500nsimulations(wherenisthenumberofobjectives)seemstobesufficient.Byanalyzingautomati-calIyamultiplicityofvarioussystemsaneffectiveoptimizationoftheconstructionistheresultoftheanalysis.Figure10.Abaqusmodelforcalculationofthehorizontaldeformationofthesheetpilehead5Summary11couldbeshownthatAbaqusbuilt-infeaturesandbaqusextensionsbasedonusersubroutinesandcouplingWithexternalprogramscanbeappliedtoso1veawiderangeofboundaryvalueproblemsinthefieldofsoi1mechanics.Thisoffersresearchersatooltoexaminesomeoftheopenproblemsingeomechanicsliketheinfluenceofconstructionprocessesforgeotechnicalconstructions,theoptimizationofgeotechnicalconstructionsregardingdeformationsortheoptimizationofconstructionprocesses1ikepenetrationofstructuresintothesubsoil.Itshouldnotbeconcealedthatthepresentedsimulationshavelimitscausedbymodel1ingfeaturesandhardwareresources.TheneedoffuturerequirementsonAbaqusfeaturescanbesummarizedasfollows:implementationofbuilt-insophisticatedconstitutivemodelsforSOils,improvednumericalstabi1iIyforlargedeformationproblemse.g.withmodern1.Econceptsandfinallyenhancedefficiencyinparallelcomputationsasalreadyshowninthelastbaqusrevisions.142008AbaqusUsersConferenceReferences1.Alsaleh,M.,NumericalmodellingofstrainlocalizationingranularmaterialsusingCosseratTheoryenhancedwithmicrofabricproperties.PhDthesis,Dep.ofCivilandEnvironmentalEngineering,1.ouisianaStateUniversity,2004.2.Arnold,M.,ZurBerechnungdesErd-undAuflastdrucksaufWinkelsttzwndeimGcbrauchszusland,Promotionsschrift,MitteilungendesInstitutsfrGeotechnikderTechnischenUniversittDresden,Hcft13,2004.3.Arslan,H.,1.ocalizationanalysisofgranularmaterialsinCosseratelastoplasticityformulationandfiniteelementimplementation,PhDthesis,Dept,ofCivil,EnvironmentalandArchitecturalEngineering,UniversityofColorado,2006.4.Dunne,F.andPetrinic,N.,Introductiontocomputationalplasticity,OxfordUniversityPress,2005.5.Gudehus,G.,comprehensiveconstitutiveequationforgranularmaterials,SoilsandFoundations,31(1):1126.2008baqusUsersConferenceGutjahr,S.,OptimierteBerechnungvonnichtgesttztenBaugrubenwndeninSand,Proinotionsschrift,Schriftenreihedes1.ehrstuhlsBaugrund-CrundbaudcrUniversittDortmund,Heft25,2003.7.Hagen,C.,FEM-BEMcouplingbymeansofAbaqusandusersubroutines.Internalreport,InstituteofGeotechnicsandConstructionManagement,HamburgUniversityofTechnology,2005.8.Helwany1S.,Appliedsoilmechanicswithbaqusapplications,JohnWileySons,2007.9.Henke,S.,Grabe,J.,SimulationofPiIeDrivingbyThreedimensiona1FiniteElementanalysis,Proc.Of17thEuropeanYoungGeotechnicalEngineeringConf.,Zagreb,Crotia,ed.byV.Szavits-Nossan,CroatianGeotechnicalSociety,pp.215233,2006.10.Henke,S.,Hgel,H.M.,RumlicheAnalysenZUrquasi-StatischcnunddynamischenPenetrationvonBauteilenindenUntergrund.Tagungsbandzur19.deutschsprachigenAbaqusBenutzerkonferenzinBaden-Baden(Germany),2007.11.Holler,S.,DynamischesMehrphasenmodellmitHypoplastischerMaterialforinulierungderFeststoffphase,Promotionsschrift,Verffentlichungendes1.ehrstuhlsfrBaustatikundBaudynamikderRWTHachen,Heft06/2,Wissenschaftsverlag,achen,2006.12.Huang,W.,Bauer,E.,AmicropolarhypoplasticmodelforgranularmaterialsanditsFEMimplementation,Proc,ofthe1stAsian-PacificCongr.onComp.Mech.(APCOMOl),eds.S.ValliappanandN.Khalili,Sydney,Australia,ElsevierScience1.td.press,11351140,2001.13.Kelm1M.,NumerischeSimulationderVerdichtungRohsionsloserBdenmitVibrationswalzen,Promotionsschrift,VerffentlichungendesInstitutsfrGeotechnikundBaubetrieb,TUHamburg-Harburg,Heft6,2003.2008AbaqusUsersConference1514.Kinzler,S.：Knig,F.,Grabe,J.,EntwurfeinerPfahlgrndunguntcrAnwcndungderMchrkriIerien-Optimierung,Bauingenieur,82(9):367379,2007.15.Kinzler,S.,Grabe,J.,WirtschaftlicheOptimierungrckverankerterSpundwandkonstruktionen,TagungsbandzumWorkshopOptimierunginderGeotechnikStrategienUndFallstudien,VerffentlichungendesInstitutsfrGeotechnikundBaubetriebdorTechnischenUniversittHamburg-Harburg1Heft12,S.6186,2006.16.Maier,T.,NumerischeModellierungderEntfestigungimRahmenderHypopIastizitt,Promotionsschrift,Schriftenreihedes1.ehrstuhlsGrundbauundBaugrundderUniversittDortmund,2003.17.Mardfeldt,B.,VerformungsverhaltenvonKaimauerkonstruktionenimGcbrauchszustand,Proniotionsschrift,VcrffentlichungendesInstitutsfrGeotechnikundBaubetriebderTechnischenUniversittHamburg-Harburg,Heft11,2005.18.Morra,G.,Chatelain,P.,GeodynamicsmodellingthroughcouplingbaquswithanacceleratedBoundaryElementMethod,Proc,of1stInt.GeoscientificbaqusWorkshopinBochum(Germany),200619.Niemunis,A.,Herlc,I.,Hypoplasticmodelforcohesionlesssoilswithelasticstrainrange,MechanicsofCohesive-FrictionalMaterials,2(4):279299,1997.20.Niemunis,.,Extendedhypoplasticmodelsforsoils,Habi1itationsschrift,VerffentlichungendcsInstitutsfrGrundbauundBodenmechanikderRuhr-UniversittBochum,Heft34,2003.21.Nbel,K.,Experimentalandnumericalinvestigationofshearlocalizationingranularmaterial,Promotionsschrift,VerffentlichungendesInslitutsfrBodcnmechanikundFelsmechanikderUniversittKarlsruhe,Heft15922.Slominski,C.,ValidierungvonRechenmodcllcnzurScherzonenentwicklungmitVersuchenim1.aborundinsitu,Promotionsschrift,VerffentlichungcndesInstitutsfrBodenmechanikundFeldmechanikderUniversittKarlsruhe,Heft169,2007.AcknowledgementTheauthorswishtothankNorthernGermanNetworkforHigh-PerformanceComputing(hlrn.de)forsupportofhardwareresources.Theresearchprojectpenetrationofstructuresintosubsoi1issponsoredbyGermanResearchFoundation(dfg.de).PicturesinSection4.1and4.2werekindlymadeavailablebyM.KelmandB.Mardfeldt.