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1、EngineeringGeology108(2009)169–176ContentslistsavailableatScienceDirectEngineeringGeologyjournalhomepage:www.elsevier.com/locate/enggeoAnexperimentalstudyofthewatertransferthroughconfinedcompactedGMZbentoniteab,⁎,L.X.Qiana,baW.M.Ye,Y.J.Cui,B.ChenaTongjiUniversity
2、,1239SipingRoad,200092Shanghai,PRChinabEcoledesPonts-ParisTech,URNavier-CERMES,6et8avenueBlaisePascal,CitéDescartes,Champs-sur-Marne,77455Marne-la-Valléecedex2,FrancearticleinfoabstractArticlehistory:GMZbentonitehasbeenconsideredasapossiblematerialforengineeredb
3、arrierintheChineseprogramofReceived20August2008nuclearwastedisposalatgreatdepth.Inthepresentwork,thehydraulicconductivityofthisbentonitewasReceivedinrevisedform11May2009determinedbysimultaneousprofilemethod.AspecificinfiltrationcellequippedwithfiveresistiverelativeA
4、ccepted13August2009humidityprobeswasdesignedforthispurpose.ThewaterretentionpropertieswerestudiedunderbothAvailableonline21August2009confinedandunconfinedconditions;theresultsshowthatathighsuctions(>4MPa)thewaterretentioncapacityisindependentoftheconfiningcondition
5、,andbycontrast,atlowsuctions(<4MPa)theconfinedKeywords:conditionresultedinsignificantlowwaterretention.Furthermore,themicrostructurewasinvestigatedatGMZbentoniteSimultaneousprofilemethodmercuryintrusionporosimetry(MIP)andEnvironmentalScanningElectronMicroscope(ESEM
6、)inInfiltrationcelldifferentstates:onoven-driedpowder,bentoniteslurry,as-compactedandwettedsamples.IthasbeenConstantvolumeconditionobservedthatthesoilpowderisconstitutedofaggregatesofvarioussizes;theseaggregatesaredestroyedHydraulicconductivitybyfullsaturationata
7、watercontentequaltotheliquidlimit;compactionattheinitialwatercontentof11–312%andadrydensityof1.7–1.75Mg/mledtoamicrostructurecharacterizedbyadenseassemblyofrelativelywellpreservedaggregates;saturationofthecompactedsampleunderconstantvolumeconditiondefinedanon-hom
8、ogeneousmicrostructurewiththepresenceofwellpreservedaggregates.Thisnon-homogeneousmicrostructurewouldbeduetothenonuniformdistributionofthegeneratedswellingpressurewit
