An efficient technique for generating homogeneous specimens for DEM studies

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1、ComputersandGeotechnics30(2003)579–597www.elsevier.com/locate/compgeoAnefficienttechniqueforgeneratinghomogeneousspecimensforDEMstudiesM.J.Jiang,J.M.Konrad*,S.LeroueilDept.ofCivilEngineering,LavalUniversity,Ste-Foy,Que´bec,CanadaG1K7P4Received3December2002;receivedinrevisedform7May2003;accepted12May2

2、003AbstractAnewtechnique,designatedastheMulti-layerwithUndercompactionMethod(UCM),capableofgeneratinghomogeneousspecimensforDEMstudiesispresentedherein.Thespecimenarecompactedinseverallayersusingundercompactioncriteriabasedonaverageplanarvoidratio.Theproposedapproachwascomparedtootheravailablemetho

3、dsandwasproventogenerateveryhomogeneousspecimensprovidedanonlinearaverageundercompactioncriterionwasused.Furthermore,theUCMmethodwasefficientforavarietyofdensityconditionsrangingfromveryloosetodensestates.#2003ElsevierLtd.Allrightsreserved.Keywords:Distinctelementmethod;Homogeneity;Numericalsimulatio

4、n;Specimengeneration1.Introductioncanbecontrolled,itisidealforunderstandingthefun-damentalbehaviourofgivenparticleassemblagesdur-Naturalsoilsconsistofparticles,macropores,micro-inganytypeofloadinganditmaybeusedtodeveloppores,porefluids(air,water,others),assembledwithandvalidateconstitutiverelationsh

5、ipsforsoils.interparticlebondingtoformafabric.ThebehaviourofSincethepioneeringworkcarriedoutmorethantwonaturalsoilsiscomplexanddifficulttodescribeade-decadesago[5,6],DEMhasproventobeausefultoolquatelybyconventionalnon-linearelasticmodelsorthatwasappliedinmanyfields,suchasfluiddynamicselasto-plasticmode

6、ls.Inordertogainsomeinsightintoandparticularlysoilmechanics.Ageneraloverviewwasthebehaviourofthesesoils,micro-mechanicsmaypresentedinreference[7]ontheapplicationofDEMtoprovehelpful.granularmedia.ResearchworkinDEMrelatedtosoilInthepast,twoapproacheswereusedtostudyparti-mechanicscanbemainlygroupedint

7、othefollowingcleinteractionusingmicromechanics.Thefirstoneusesareas:laboratoryexperimentsonnaturalsandorrodstoobservethechangesinthecontactdistributionwithin1.Staticbehaviourofgranularmediausingdiffer-thespec