DEM and experimental analysis of the water retention curve in polydisperse granular media.pdf

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1、PowderTechnology208(2011)296–300ContentslistsavailableatScienceDirectPowderTechnologyjournalhomepage:www.elsevier.com/locate/powtecDEMandexperimentalanalysisofthewaterretentioncurveinpolydispersegranularmediaJ.-P.Gras⁎,J.-Y.Delenne,F.Soulié,M.S.ElYoussoufiLMG

2、C,CNRS-UniversitéMontpellierII,PlaceEugèneBataillon,34095Montpelliercedex05,FrancearticleinfoabstractAvailableonline25August2010Weinvestigatethewaterdistributionandthelinkbetweensuctionandwatercontentingranularmedia.Firstly,weexaminetheeffectofsuctiononthesh

3、apeandthevolumeoftheliquidbridgebyfourdifferentKeywords:methods.MethodIisbasedonthelocalexpressionofthecapillaryforcecoupledwiththegorgemethodandCapillarityMethodIIisbasedontheLaplacelaw.Thesetwomethodsusethetoroidalapproximation.MethodsIIIandIVLiquidbridgea

4、rebasedontheintegrationofthedifferentialequationthatdefinestheliquidbridgeshape(establishedWaterretentioncurvefromtheLaplacelaw).ThislocalbehaviouristhenusedinadiscreteelementstudyofasamplecomposedofPolydispersityseveralthousandsofgrains.Wefocusourstudyonthep

5、endularstate.AliquidfilmaroundthegrainsGranularmediaDEMsimulationinvolvingthecontinuityoftheliquidphaseisassumed.Thewaterdistributionandthewatercontentassociatedwithagivensuctionarecalculated.Thenretentioncurvesofthegranularmediaarebuilt.Aparametricstudyismad

6、etobringtolighttheeffectofmacroscopicparameters(grain-sizedistribution)andphysicalparameters(liquid/airsurfacetensionandcontactangle)onthewaterretentioncurve.Finally,numericaldataarecomparedtoexperimentalresults.©2010ElsevierB.V.Allrightsreserved.1.Introduct

7、ionscale.Capillaryforcesaresufficienttoensurethemechanicalstabilityofasoilevenwithoutexternalstressconfinement(sandcastles).ArealisticdescriptionofthephysicalphenomenaatthegrainscaleFormerworksoncapillaryforcesinagranularmedia—usingDEM—isnecessarytounderstandb

8、ettertheoverallbehaviourofagranularunderlinedtheeffectofcapillaryinteractionsonthemacroscopicmaterial.Themacroscopicbehaviourcanthenbepredictedbycohesion[2,3].Twopointshavebeenunderlined:thenumb