Optimization-and-Management-of-Materials-in-Earthw

IowaStateUniversityDigitalRepository@IowaStateUniversityTechTransferSummariesInstituteforTransportation5-1-2010OptimizationandManagementofMaterialsinEarthworkConstructionVernonR.SchaeferIowaStateUniversity,[e-mail],[e-mail]alworksat:@IowaStateUniversity.IthasbeenacceptedforinclusioninTec[e-mail],[e-mail]fer,VernonR.andWhite,DavidJ.,OptimizationandManagementofMaterialsinEarthworkConstruction(2010).TechTransferSummaries.Paper13.fiedproblemsthroughbettermanagementandoptimizationoftheavailablepavementgeotechnicalmaterialsandthroughgroundimprovement,soilreinforcement,andothersoiltreatmenttechniques.InstituteforTransportationIowaStateUniversity2711S.LoopDrive,Suite4700Ames,IA50010-8664515-294-8103ThemissionoftheInstituteforTransporta-tion(InTrans)atIowaStateUniversityistodevelopandimplementinnovativemethods,materials,andtechnologiesforimprovingtransportationefficiency,safety,reliability,andsustainabilitywhileimprovingthelearn-ingenvironmentofstudents,faculty,andstaffintransportation-relatedfields.Thesponsorsofthisresearcharenotrespon-siblefortheaccuracyoftheinformationpresentedherein.Theconclusionsexpressedinthispublicationarenotnecessarilythoseofthesponsors.May2010OptimizationandManagementofMaterialsinEarthworkConstructionRESEARCHPROJECTTITLEOptimizationandManagementofMaterialsinEarthworkConstructionSPONSORSIowaHighwayResearchBoard(TR-501)IowaDepartmentofTransportation(InTransProject04-162)PRINCIPALINVESTIGATORVernSchaeferProf.,Civil,Construction&[e-mail].,Civil,Construction&[e-mail]•Evaluatetheengineeringpropertiesofembankmentmaterialsbymixingdifferentsoils,suchastheselectandunsuitablesoilsindifferentproportions.•Evaluatethepermeabilityofmixedmaterials.•Evaluatetheuseofflowablemortarinplaceofconventionalbackfillmaterialaroundadrainagepipe.ProblemStatementNaturalearthmaterialsplayanimportantroleinthedesignandcon-structionofgeotechnicalsystems.Differentearthmaterials,suchassoilandrock,havebeenusedintheconstructionofvariousgeotechnicalsystems,includingfoundations,retainingwalls,embankments,roadandairfieldpavements,boxculverts,andbridgeabutments.Thechoiceofparticulargeo-materialsforaconstructionprojectdependsonthetypeandpurposeofthegeotechnicalsystemitself.Somegeo-materials,suchaspeat,muck,expansive/swellingsoils,andcollapsiblesoils,however,cannotbeusedinanytypeofconstructionbecausetheseverityofpost-constructiondamagetheymaycausecanbedisconcert-ing.Often,sitesoilsareunacceptablefortheintendedfunctionandmustbeimprovedorreplacedwithbetterqualitymaterials.ResearchDescriptionAsaresultofforensicinvestigationsofproblemsacrossIowa,aresearchstudywasdevelopedaimedatprovidingsolutionstoidentifiedproblemsthroughabettermanagementandoptimizationoftheavailablepavementgeotechnicalmaterialsandthroughgroundimprovement,soilreinforce-ment,andothersoiltreatmenttechniques.Theoverallgoalwasworkedoutthroughsimplelaboratoryexperiments,suchasparticlesizeanalysis,plasticitytests,compaction,permeability,andstrengthtests.Areviewoftheproblemssuggestedthreeareasofstudy:pavementcrackingduetoimpropermanagementofpavementgeotechnicalmaterials,permeabilityofmixed-subgradesoils,andsettle-mentofsoilabovethepipeduetoimpropercompactionofthebackfill.Thisresultedinthefollowingthreeareasofstudy:Theoptimizationandmanagementofearthworkmaterialsthrough1.generalsoilmixingofvariousselectandunsuitablesoilsandaspe-cificexampleofoptimizationofmaterialsinearthworkconstructionbysoilmixing.Aninvestigationofthesaturatedpermeabilityof2.compactedglacialtillrelationtovalidationandpredictionwiththeEnhancedIntegratedClimaticModel(EICM).Afieldinvestigationandnumericalmodelingof3.culvertsettlement.Thisprojectconsistsofthefollowingthreeareasofresearch.OptimizationandManagementofEarthworkMateri-alsthroughSoilMixingThreesoilsavailableforearthworkconstructionareclassifiedasselect,suitable,andunsuitablesoils(Table1).Unsuitablesoilsconsistofsomeexpansive/swellingorcollapsiblesoilswithlowdensityandlowstrength,whichshouldbedisposedofatleast3feetbelowsub-gradeelevation.Duetotheavailabilityandthefactthatunsuitablesoilsarecheaperthanselectsoils,makinguseofunsuitablesoilscanreducethecostofearthworkconstruction.Inthisresearch,twounsuitablesoilsweremixedwithsixselectsoilsatvariousproportions(unsuitable:select=25%:75%,50%:50%,and75%:25%)toinvestigatehowtheengineeringpropertiescanbeimprovedatdifferentselect-unsu