Effects of pore fluid salinity on the shear strength of a soft clay .pdf

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1、Effectsofporefluidsalinityontheshearstrengthofasoftclay1J.A.Pineda,R.Kelly,L.Bates,D.ShengandS.Sloan1ARCCentreofExcellenceforGeotechnicalScienceandEngineering,TheUniversityofNewcastleAustralia,P.O.Box2308,Newcastle,NSW,CallaghanCampus,UniversityDrive,BuildingEA;PH(61)2-4

2、921-7073;FAX(61)2-49216991;email:jubert.pineda@newcastle.edu.auABSTRACTThepaperpresentstheresultsfromapreliminarystudyfocusedontheinfluenceofporefluidsalinityontheshearstrengthofasoftclayfromNewSouthWales(Australia).Directsheartests(DST)werecarriedoutonnaturalspecimensus

3、ingporefluidswithdifferentsaltconcentrations.Electricalconductivitymeasurementswereperformedonthesqueezedporewateraftershearingtoquantifychangesinsalinityofthesoilporewater.Strengthparametersshowedacleardependencyoftheporefluid.Changesinc’and’appeartobecontrolledbytwofa

4、ctors:(i)initialsalinity,and(ii)extentoftheconcentrationgradient.Resultsfrommercuryintrusionporosimetrytestsdemonstratedtheinfluenceofchangesinporewatersalinityontheevolutionofthedominantporesize.Itwasinagreementwithmacroscopicobservations.Implicationsforfurtherlaborator

5、ytestingarehighlightedinthepaper.INTRODUCTIONNaturalestuarinesoftclaystypicallybearsomeimprintsofthecomplexgeologicalandgeochemicalenvironmentswheretheyhavebeenformed.Alterationoftheseenvironmentsmaysignificantlyaltertheirphysicalandmechanicalpropertieswhicharealsoaffect

6、edbymechanical,hydraulic,thermalandchemicalactions.Itaddsadditionalchallengesforgeotechnicalpractitionersdealingwithsettlementandstabilityanalysisofgeotechnicalstructuresfoundedonthosematerials.Ballinaclay,asoftestuarineclayfromtheRichmondRivervalleyinnorthernNewSouthWal

7、es(Australia)isanexampleofthesecomplexestuarineclaydeposits.DuetotheupgradingofthePacificHighway–linkingSydneyandBrisbane-extensivein-situandlaboratoryprogramshasbeencarriedoutduringlasttwodecadeswithparticularemphasisonsettlementanalysis.Duetothediscrepanciesobservedbet

8、weenin-situandlaboratorymeasurementsneweffortshasbeingfocusedonthedevelopmentofahigh-levelresearchprogr