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1、thThe12InternationalConferenceofInternationalAssociationforComputerMethodsandAdvancesinGeomechanics(IACMAG)1-6October,2008Goa,IndiaTheStress-Strain-StrengthBehaviourofaCompletelyDecomposedGraniteSoilUsingaNewAdvancedTrueTriaxialTestingSystemJian-HuaYinDepartmentofCi
2、vilandStructuralEngineering,TheHongKongPolytechnicUniversity,Kowloon,HongKong,ChinaMd.KumruzzamanDepartmentofCivilandStructuralEngineering,TheHongKongPolytechnicUniversity,Kowloon,HongKong,ChinaKeywords:stress,strain,strength,behaviour,soil,triaxial,truetriaxial,tes
3、tABSTRACT:Completelydecomposedgranite(CDG)soilisthemostcommontypeofsoilsfoundinmorethan90%ofthelandareainHongKong.Themeasurementofthestress-strain-strengthbehaviouroftheCDGsoilisveryimportantfordeformationandstabilityanalysisofslopes,retainingwalls,excavations,deepa
4、ndshallowfoundationsrelatedtotheCDGsoilground.Asmostofthesegeotechnicalstructuresareinathree-dimensional(3-D)stressstateorapproximatelyinaplanestraincondition,themeasurementofthebehaviouroftheCDGsoilina3-Dstressstateoraplanestrainconditionisnecessary.Inthispaper,fir
5、st,anewtruetriaxialloadingdeviceanditssetupfortestingareintroduced.Second,typicaltestresultsfromaseriesoftruetriaxialtestsontheCDGsoilwithdifferentb-valuesarepresentedanddiscussed.Thesetestsareusedtostudytheinfluenceofintermediateprincipalstressonthemechanicalbehavi
6、ourofthere-compactedcompletelydecomposedgranitesoil.Third,typicaltestresultsfromaseriesofplanestraintestsonthesamesoilarepresentedanddiscussed.Thesetestresultsareusedtostudythestress-strain-strengthcharacteristicsofthesoilinaplanestraincondition.1Introduction2Thelan
7、dareaofHongKongis1101kmwithapopulationof6.9million.InHongKong’sgeology,themainrocktypeisgranite,approximately90%.Theweatheringoftherockhasresultedincompletelydecomposedgranite(CDG)soilinthemostlandarea.Therefore,theCDGiscommonlyencounteredinmostprojectsinHongKong,fo
8、rexample,excavations,constructionofhighways,tunnelling,andslopestabilization.TheparametersoftheCDGsoilarerequiredfordesignanalysisofnewgeo
