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时间:2019-03-08
《DEM and experimental analysis of the water retention curve in polydisperse granular media.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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