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1、Soil&SedimentContamination,17:316–322,2008Copyright©Taylor&FrancisGroup,LLCISSN:1532-0383print/1549-7887onlineDOI:10.1080/15320380802143880MembraneBehaviorofSoil-BentoniteSlurry-TrenchCutoffWallsJEFFREYC.EVANS,1CHARLESD.SHACKELFORD,2SANG-SIKYEO,3ANDJOHNHENNING41DepartmentofCivilandEnvironmentalEngi
2、neering,BucknellUniversity,Lewisburg,PA,USA2ColoradoStateUniversity,FortCollins,CO,USA3GeosyntecConsultants,SanDiego,CA,USA4DawoodEngineering,Canonsburg,PA,USAInvestigationsofmembranebehaviorinbentonite-basedsoil-bentonite(SB)backfillsusedinverticalcutoffwallsforwastecontainmentandsiteremediationhav
3、eyieldedencouragingresults.Laboratoryinvestigationsusingmodelsoil-bentonitematerialsaswellassamplesobtainedduringslurrywallconstructionhavebeentestedformembranebehavior.Theresultsindicatethattwomodelbackfills,anaturalclaywith89%finesandamixtureofcleansandwith5%byweightofdrysodiumbentonite,actassemi-D
4、ownloadedBy:[ColoradoStateUniversityLibraries]At:13:0022July2008permeablemembranes.Thechemico-osmoticefficiencycoefficients,ω,forthenaturalclayrangefrom0.018to0.024,whereasωforthesand-bentonitebackfillrangefrom0.118to0.166.ThetwoSBbackfillsrecoveredfromthefieldalsoexhibitedmembranebehavior,withωrangingf
5、rom0.0119to0.0140forabackfillrecoveredfromacutoffwallinNewJerseyandfrom0.0019to0.0172forabackfillrecoveredfromacutoffwallinDelaware.AlthoughtherangeofωvaluesforthefieldSBbackfillswaslowerthanthatforthemodelSBbackfills,modelingrevealedthatthemeasuredmembranebehaviorforthefieldSBbackfillswouldresultinareduc
6、tionincontaminanttransportbyasmuchas10%relativetothatwheremembranebehaviorisnotconsidered.Keywordssoil-bentonite,slurrywalls,osmosis,bentoniteIntroductionContainmentand,inparticular,slurrywallshavebeenwidelyusedformorethan25yearstocontrolthemigrationofcontaminantsinthesubsurface.IntheUSA,verticalba
7、rriersaremostoftenconstructedofsoil-bentoniteusingtheslurrytrenchmethodofconstruction(EvansandDawson,1999).Inthismethod,sodiumbentoniteismixedwithwatertoformaviscousslurrythatispumpedintoatrenchduringexcava
