Suction induced effects on the fabric of a structured soil
18 Pages
English
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Suction induced effects on the fabric of a structured soil

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18 Pages
English

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TDraOnIsp1o0.r1t0i0n7/Pso1r1o2u4s2-M00e5d-i3a6(5260-036)64:261278SuctionInducedEffectsontheFabricofaStructuredSoil©Springer2006AZADKOLIJI1,LYESSELALOUI1,,OLIVIERCUSINIER1,2andLAURENTVULLIET11EcolePolytechniqueFe´de´raledeLausanne(EPFL),Laboratoiredeme´caniquedessols(LMS),CH-1015Lausanne,Switzerland2LaboratoireEnvironnement,Ge´ome´canique&Ouvrages,EcoleNationaleSupe´rieuredeGe´ologie-INPL,F-54501Nancy,France(Received:18May2005;acceptedinfinalform:10September2005)Abstract.Thispaperpresentsthemathematicalmodellingofthemodificationoftheporespacegeometryofastructuredsoilsubjectedtosuctionincrease.Structuredsoilcon-ceptsarefirstintroducedconsideringdifferentfabricunits,suchasaggregatesandfis-sures.Thenumericalmodellingofthestructuralevolutionisbasedonexperimentaltestresultsinwhichtheevolutionofthestructureofthesamplessubjectedtodifferentsuc-tionsisdeterminedusingthemercuryintrusionporosimetrytechnique.Fromthisinfor-mation,themacroandmicroporevolumeevolutionsaredetermined.Theresultsshowthatdryingproducesareductioninthesoiltotalporositywhichmainlycorrespondstoareductionofthemacroporevolume.Associatedwiththisphenomenon,anincreaseinmicroporevolumeisalsoobserved.Theproposedmodeldividesporesizedistributionintothreeporeclasses(micropores,macroporesandnon-affectedareas).Usingtheconceptofasuction-influenceddomain,theproposedmodelisabletoreproducethemainobservedfabricevolutionbetweenthesaturatedanddrystates.Keywords:structuredsoil,fabric,suction,poresizedistribution.ListofnotationformathematicalequationsRTheentranceporeradiusTsSurfacetensionoftheliquidαContactangleoffluidinterfacetosolidψSuctionψ0InitialsuctionψfFinalsuctionR(ψ)ThedrainedporeradiusatthatvalueofsuctionψAuthorforcorrespondence:Tel.:+41-21-693-23-14;Fax:+41-21-693-41-53;E-mail:lyesse.laloui@epfl.ch