The Unsaturated Shear Strength And Swelling Charac Teristics Of Expansive Soils Of Arbaminch

InEthiopia,somanyresearchesweredoneoncharacterizingexpansivesoilsofseveraltownsbutonlyasinglestudy,doneonAddisAbabaexpansivesoil,existsontheunsaturatedshearstrengthbehaviorofexpansivesoils.ThepresentstudyaddressesexaminingtheexpansivesoilsinArbaMinch–atownwithagreatportionofitsterraincoveredbythesamesoilbutnotconsideredinpreviousstudies.Alaboratory-testingprogramwasplannedandcarriedoutonundisturbedsoilsamplestakenfrom10differentlocationsinthetownforswellingpressuretesting;andamongthese,onepitwasallottedforunsaturatedshearstrengthstudy.rnThelaboratorytestresultsrevealedthattheswellingpressurerangesfrom74.53to571.29kPa,SpecificGravityfrom2.63to2.80,PlasticityIndexfrom49to77%,ShrinkageIndexfrom81to117%andFreeSwellfrom94.0to165.0%.Themeasuredswellingpressuresandthegeotechnicalparametersdeterminedfromidentificationtestsareusedtoassessthevalidityofalreadydevelopedexpressionsbyvariousresearcherstothesiteunderstudyandnewmodels,thatrelateswellingpressurewithindexandphysicalproperties,aredevelopedusingSPSS16.0forwindowssoftware.rnTheresultsfromunsaturatedshearstrengthtestsperformedwitha50kNmodifieddoublewalltriaxialmachineonanundisturbedsamplesettingmatricsuctiontobe100kPa,150kPaand200kPaforaneffectiveconsolidationpressureof200kPahaveclearlyindicatedthesaturatedcasetoyieldsmallershearstrengththantheunsaturatedone.Themaximumdeviatorstressshowedtoincreasefrom107.61kPato174.35kPawithanincreaseinmatricsuctionbuttheshapeofthestress-straindiagramremainedidentical.

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