Interpretation of Horizontal Coefficient of Consolidation from Piezocone Porewater Pressure Dissipation Tests

Mrinmoy Kanungo

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Soil and Rock Mechanics II

ABSTRACT: MethodsforinterpretingthehorizontalcoefficientofconsolidationfrarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticaldatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconeporewaterpressuredissipationtestswereperformedusingastandardshoulderexistingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterissubjecttomuchuncertainty.SomecommonlyarediscusseRÉSUMÉLesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdespressionsinterstitiellesaupiézocône,sopiézocôneprovenantdedépôtsd™argilesilteusedusudconsolidationhorizontalsontégalementcomparéesauxvaleursducessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstaexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréepourl™interprétationdesdonnéespr1INTRODUCTIONThepiezoconepenetrationtest(CPTu)popularinsitutestingtechniquebyvirtueofitsreliabilityandrelativelyrapidtestingratethatproducesasemicontinuous(every2or5cm)profileofsoildepositadditiontosoilmechanicsparametersproperties,consolidation(cpressuredissipationtestsperformedduringpiezoconetesting.Inhighlystratifiedorvarvedcohesivesoils,hydraulicconductivityordersofmagnitudehigherthanintheverticaldirectionandcansignificantlyinfluencegeotechnicalsuchasthetimestateseepageconditions.Settlementpredictioninvolvingprefabricatedverticaldrach.WhileconductingaCPTu,thebehaltedatanydepthandwaterpressuregeneratedduringpenetrationcanbemonitored.beusedtoestimatetheinsituhorizontalcoefficientofconsolidationandhydraulicconductivity.Othermethodsofestimatinghydraulicconductivityofsoildeposits(e.g.,insituslugtesting,pumpingtests)orlaboratorymethodscanbetimesampledisturbancetestthusaffordsanopportunityforefficientdeterminationofhydraulicpropertiesofsoilsInterpretationofHorizontalCoefficientofConsolidationfromPiezoconePorewaterPressureDissipationTestsMrinmoyKanungoGolderAssociatesLtd.,London,ON,CanadaABSTRACTMethodsforinterpretingthehorizontalcoefficientofconsolidationfrarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticaldatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconeporewaterpressuredissipationtestswereperformedusingastandardshoulderstingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterissubjecttomuchuncertainty.Somecommonlyarediscussedandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdespressionsinterstitiellesaupiézocône,sopiézocôneprovenantdedépôtsd™argilesilteusedusudconsolidationhorizontalsontégalementcomparéesauxvaleursducessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstaexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréepourl™interprétationdesdonnéesprINTRODUCTIONThepiezoconepenetrationtest(CPTu)popularinsitutestingtechniquebyvirtueofitsreliabilityandrelativelyrapidtestingratethatproducesasemicontinuous(every2or5cm)profileofsoildepositadditiontosoilmechanicsparametersproperties,suchasthehorizontalcoefficientofconsolidation(ch),canbeestimatedfromporewaterpressuredissipationtestsperformedduringpiezocone.Inhighlystratifiedorvarvedcohesivesoils,hydraulicconductivityinthehorizontaldirectioncanbordersofmagnitudehigherthanintheverticaldirectionandcansignificantlyinfluencegeotechnicalsuchasthetime-rateoffoundationsettlementorsteadystateseepageconditions.Settlementpredictioninvolvingprefabricatedverticaldra.WhileconductingaCPTu,thebehaltedatanydepthandwaterpressuregeneratedduringpenetrationcanbemonitored.Porepressuretoestimatetheinsituhorizontalcoefficientofconsolidationandhydraulicconductivity.Othermethodsofestimatinghydraulicconductivityofsoildeposits(e.g.,insituslugtesting,pumpingtests)orlaboratorymethodscanbetime-consuming,sampledisturbance(DeGrootetal.2012testthusaffordsanopportunityforefficientdeterminationhydraulicpropertiesofsoilsInterpretationofHorizontalCoefficientofConsolidationfromPiezoconePorewaterPressureDissipationTestsGolderAssociatesLtd.,London,ON,CanadaMethodsforinterpretingthehorizontalcoefficientofconsolidationfrarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticaldatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconeporewaterpressuredissipationtestswereperformedusingastandardshoulderstingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterissubjecttomuchuncertainty.Somecommonlydandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdespressionsinterstitiellesaupiézocône,sopiézocôneprovenantdedépôtsd™argilesilteusedusudconsolidationhorizontalsontégalementcomparéesauxvaleursducessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstaexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréepourl™interprétationdesdonnéesprovenantdesessaisaupiézocôneThepiezoconepenetrationtest(CPTu)popularinsitutestingtechniquebyvirtueofitsreliabilityandrelativelyrapidtestingratethatproducesasemicontinuous(every2or5cm)profileofsoildepositadditiontosoilmechanicsparameterssuchasthehorizontalcoefficientof),canbeestimatedfromporewaterpressuredissipationtestsperformedduringpiezocone.Inhighlystratifiedorvarvedcohesivesoils,inthehorizontaldirectioncanbordersofmagnitudehigherthanintheverticaldirectionandcansignificantlyinfluencegeotechnicalrateoffoundationsettlementorsteadystateseepageconditions.Settlementpredictioninvolvingprefabricatedverticaldrainsalsorequires.WhileconductingaCPTu,theprobebehaltedatanydepthanddissipationofwaterpressuregeneratedduringpenetrationcanbepressuredissipationtestdatacantoestimatetheinsituhorizontalcoefficientofconsolidationandhydraulicconductivity.Othermethodsofestimatinghydraulicconductivityofsoildeposits(e.g.,insituslugtesting,pumpingtests)orlaboratorymethodsconsuming,expensive,DeGrootetal.2012testthusaffordsanopportunityforefficientdeterminationhydraulicpropertiesofsoils.InterpretationofHorizontalCoefficientofConsolidationfromPiezoconePorewaterPressureDissipationTestsGolderAssociatesLtd.,London,ON,CanadaMethodsforinterpretingthehorizontalcoefficientofconsolidationfrarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticaldatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconeporewaterpressuredissipationtestswereperformedusingastandardshoulderstingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterissubjecttomuchuncertainty.Somecommonly-usedtheoreticalandempiricalrelationshipsforestimatingtherigidityindexdandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdespressionsinterstitiellesaupiézocône,sontréviséesetévaluéesdansleprésentarticleenutilisantdesdonnéesdepiézocôneprovenantdedépôtsd™argilesilteusedusudconsolidationhorizontalsontégalementcomparéesauxvaleursducessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstaexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréeovenantdesessaisaupiézocôneThepiezoconepenetrationtest(CPTu)hasbecomeapopularinsitutestingtechniquebyvirtueofitsreliabilityandrelativelyrapidtestingratethatproducesasemicontinuous(every2or5cm)profileofsoildepositadditiontosoilmechanicsparameters,hydraulicsuchasthehorizontalcoefficientof),canbeestimatedfromporewaterpressuredissipationtestsperformedduringpiezocone.Inhighlystratifiedorvarvedcohesivesoils,inthehorizontaldirectioncanbordersofmagnitudehigherthanintheverticaldirectionandcansignificantlyinfluencegeotechnicalbehaviourrateoffoundationsettlementorsteadystateseepageconditions.Settlementpredictioninvolvingalsorequiresanestimateofprobepenetrationcandissipationofexcessporewaterpressuregeneratedduringpenetrationcanbedissipationtestdatacantoestimatetheinsituhorizontalcoefficientofconsolidationandhydraulicconductivity.Othermethodsofestimatinghydraulicconductivityofsoildeposits(e.g.,insituslugtesting,pumpingtests)orlaboratorymethodsive,andaffectedbyDeGrootetal.2012).ThedissipationtestthusaffordsanopportunityforefficientdeterminationInterpretationofHorizontalCoefficientofConsolidationfromPiezoconePorewaterMethodsforinterpretingthehorizontalcoefficientofconsolidationfrarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticaldatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconeporewaterpressuredissipationtestswereperformedusingastandardshoulderstingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterisusedtheoreticalandempiricalrelationshipsforestimatingtherigidityindexdandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdesntréviséesetévaluéesdansleprésentarticleenutilisantdesdonnéesdepiézocôneprovenantdedépôtsd™argilesilteusedusud-ouestdel™Ontario.Lesvaleursestiméesducoefficientdeconsolidationhorizontalsontégalementcomparéesauxvaleursducessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstaexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréeovenantdesessaisaupiézocônehasbecomeapopularinsitutestingtechniquebyvirtueofitsreliabilityandrelativelyrapidtestingratethatproducesasemi-continuous(every2or5cm)profileofsoildeposits.Inhydraulicflowsuchasthehorizontalcoefficientof),canbeestimatedfromporewaterpressuredissipationtestsperformedduringpiezocone.Inhighlystratifiedorvarvedcohesivesoils,inthehorizontaldirectioncanbeordersofmagnitudehigherthanintheverticaldirectionbehaviourrateoffoundationsettlementorsteadystateseepageconditions.Settlementpredictioninvolvinganestimateofpenetrationcanexcessporewaterpressuregeneratedduringpenetrationcanbedissipationtestdatacanthentoestimatetheinsituhorizontalcoefficientofconsolidationandhydraulicconductivity.Othermethodsofestimatinghydraulicconductivityofsoildeposits(e.g.,insituslugtesting,pumpingtests)orlaboratorymethodsaffectedbyThedissipationtestthusaffordsanopportunityforefficientdeterminationVariousmethodshavebeenpublishedforpredictingthevaluesofanddilatoryporepressuredecay,notablyTehandHoulsby(1991),Schnaidetal.(1997),Sullyetal.(1999),BurnsandMayne(1998),Chaietal.(2012),etc.ManyofthesemethodspresentdifferenttechniquestoestimatethetipressureandsubsequentlyadopttheTehandHoulsbysolutionforestimatingabasisofallofthesemethodsisthe-aparameterthatisdifficulttoMayne1998).MethodstodetermineItheoreticalrelationshipstoempiricalrelationships,mostofwhicharesubjecttoThispaperpresentsdatafromdissipationtestsperformedinsiltyclaydandevaluatesThelocationoftheporepressurefilterelementinallofthetestswasthestandarduthecone.ExistingmethodsofestimatingIarediscussedandanewempiricalrelationshipisproposedforestimatingIcommonlyusedmethodsforinterpretingpresented.Foracomparativeevaluationofthesemethods,thevaluesofarecomparedtotheverticalcoefficientofconsolidation(cv)estimatedfromlaboratoryoedometertestsperformedonsamplesatcorrespondingdepthsfromnearbyboreholes.InterpretationofHorizontalCoefficientofConsolidationfromPiezoconePorewaterMethodsforinterpretingthehorizontalcoefficientofconsolidationfrompiezoconeporewaterpressuredissipationtestsarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticaldatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconeporewaterpressuredissipationtestswereperformedusingastandardshoulder-mountedporepressuretransducer.Moststingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterisusedtheoreticalandempiricalrelationshipsforestimatingtherigidityindexdandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdesntréviséesetévaluéesdansleprésentarticleenutilisantdesdonnéesdeouestdel™Ontario.Lesvaleursestiméesducoefficientdeconsolidationhorizontalsontégalementcomparéesauxvaleursducoefficientdeconsolidationverticalobtenuespardesessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstaexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréeovenantdesessaisaupiézocône.ariousmethodshavebeenpublishedforpredictingthevaluesofchfromdissipatianddilatoryporepressuredecay,notablyTehandHoulsby(1991),Schnaidetal.(1997),Sullyetal.(1999),BurnsandMayne(1998),Chaietal.(2012),etc.Manyofthesemethodspresentdifferenttechniquestoestimatethetimeto50%dissipationoftheexcessporewaterpressureandsubsequentlyadopttheTehandHoulsbysolutionforestimatingbasisofallofthesemethodsistheaparameterthatisdifficulttoMayne1998).MethodstodetermineItheoreticalrelationshipstoempiricalrelationships,mostofwhicharesubjecttoThispaperpresentsdatafromdissipationtestsperformedinsiltyclaydandevaluatessomeThelocationoftheporepressurefilterelementinallofthetestswasthestandarduthecone.ExistingmethodsofestimatingIarediscussedandanewempiricalrelationshipisproposedforestimatingIcommonlyusedmethodsforinterpretingpresented.Foracomparativeevaluationofthesemethods,thevaluesofarecomparedtotheverticalcoefficientofconsolidation)estimatedfromlaboratoryoedometertestsperformedonsamplesatcorrespondingdepthsfromnearbyboreholes.ompiezoconeporewaterpressuredissipationtestsarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.Estimatedhorizontalcoefficientsofconsolidationarealsocomparedinthispapertoverticalcoefficientofconsolidationdatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconemountedporepressuretransducer.Moststingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterisusedtheoreticalandempiricalrelationshipsforestimatingtherigidityindexdandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdesntréviséesetévaluéesdansleprésentarticleenutilisantdesdonnéesdeouestdel™Ontario.Lesvaleursestiméesducoefficientdeoefficientdeconsolidationverticalobtenuespardesessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdespressionsinterstitiellesontétéeffectuésàl™aided™untransducteurdepressionstandard.Laplupartdesméthodesexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesecourammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréeariousmethodshavebeenpublishedforpredictingfromdissipationtestsforbothmonotonicanddilatoryporepressuredecay,notablyTehandHoulsby(1991),Schnaidetal.(1997),Sullyetal.(1999),BurnsandMayne(1998),Chaietal.(2012),etc.Manyofthesemethodspresentdifferenttechniquestoestimatemeto50%dissipationoftheexcessporewaterpressureandsubsequentlyadopttheTehandHoulsbysolutionforestimatingch.AcommonparameterthatformsbasisofallofthesemethodsistheaparameterthatisdifficulttoMayne1998).MethodstodetermineItheoreticalrelationshipstoempiricalrelationships,mostofwhicharesubjecttosignificantuncertaintyThispaperpresentsdatafromdissipationtestsperformedinsiltyclaydepositsinSouthwesternOntariosomeexistingmethodsThelocationoftheporepressurefilterelementinallofthetestswasthestandardu2location,i.e.,attheshoulderofthecone.ExistingmethodsofestimatingIarediscussedandanewempiricalrelationshipisproposedforestimatingIr.Abriefoverviewofsomeofthecommonlyusedmethodsforinterpretingpresented.Foracomparativeevaluationofthesemethods,thevaluesofchestimatedusingthesemethodsarecomparedtotheverticalcoefficientofconsolidation)estimatedfromlaboratoryoedometertestsperformedonsamplesatcorrespondingdepthsfromnearbyompiezoconeporewaterpressuredissipationtestsarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.coefficientofconsolidationdatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconemountedporepressuretransducer.Moststingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterisusedtheoreticalandempiricalrelationshipsforestimatingtherigidityindexdandanewempiricalrelationshipissuggestedforinterpretationofpiezoconetestdata.Lesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdesntréviséesetévaluéesdansleprésentarticleenutilisantdesdonnéesdeouestdel™Ontario.Lesvaleursestiméesducoefficientdeoefficientdeconsolidationverticalobtenuespardesessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdesndard.Laplupartdesméthodesexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditédessols,quiestunparamètresujetàdenombreusesincertitudes.Certainesrelationsthéoriquesetempiriques,courammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréeariousmethodshavebeenpublishedforpredictingontestsforbothmonotonicanddilatoryporepressuredecay,notablyTehandHoulsby(1991),Schnaidetal.(1997),Sullyetal.(1999),BurnsandMayne(1998),Chaietal.(2012),etc.Manyofthesemethodspresentdifferenttechniquestoestimatemeto50%dissipationoftheexcessporewaterpressureandsubsequentlyadopttheTehandHoulsby.Acommonparameterthatformsbasisofallofthesemethodsisthesoilrigidityindex(Iaparameterthatisdifficulttodetermine(BurnsandMayne1998).MethodstodetermineIrhaverangedfromtheoreticalrelationshipstoempiricalrelationships,mostofuncertainty.ThispaperpresentsdatafromdissipationtestsepositsinSouthwesternOntarioexistingmethodsforestimatingThelocationoftheporepressurefilterelementinallofthelocation,i.e.,attheshoulderofthecone.ExistingmethodsofestimatingIrforclayeysoilsarediscussedandanewempiricalrelationshipis.Abriefoverviewofsomeofthecommonlyusedmethodsforinterpretingcpresented.Foracomparativeevaluationoftheseatedusingthesemethodsarecomparedtotheverticalcoefficientofconsolidation)estimatedfromlaboratoryoedometertestsperformedonsamplesatcorrespondingdepthsfromnearbyompiezoconeporewaterpressuredissipationtestsarereviewedandevaluatedinthispaperusingpiezoconedatafromsiltyclaydepositsinSouthwesternOntario.coefficientofconsolidationdatadeterminedfromlaboratoryoedometertestsperformedonsamplesfromnearbyboreholes.Thepiezoconemountedporepressuretransducer.MoststingmethodsbaseinterpretationofporepressuredissipationtestsontherigidityindexofsoilsyetthisparameterisusedtheoreticalandempiricalrelationshipsforestimatingtherigidityindexLesméthodesd™interprétationducoefficientdeconsolidationhorizontal,baséessurlesessaisdedissipationdesntréviséesetévaluéesdansleprésentarticleenutilisantdesdonnéesdeouestdel™Ontario.Lesvaleursestiméesducoefficientdeoefficientdeconsolidationverticalobtenuespardesessaisdométriques,effectuéssurdeséchantillonsprovenantdeforagesàproximité.Lesessaisdedissipationdesndard.Laplupartdesméthodesexistantespourl™interprétationdesessaisdedissipationdespressionsinterstitiellessontbaséessurl™indicederigiditétempiriques,courammentutiliséespourestimerl™indicederigidité,sontcommentésetunenouvellerelationempiriqueestsuggéréeariousmethodshavebeenpublishedforpredictingontestsforbothmonotonicanddilatoryporepressuredecay,notablyTehandHoulsby(1991),Schnaidetal.(1997),Sullyetal.(1999),BurnsandMayne(1998),Chaietal.(2012),etc.Manyofthesemethodspresentdifferenttechniquestoestimatemeto50%dissipationoftheexcessporewaterpressureandsubsequentlyadopttheTehandHoulsby.Acommonparameterthatformsrigidityindex(Ir)determine(Burnsandhaverangedfromtheoreticalrelationshipstoempiricalrelationships,mostofThispaperpresentsdatafromdissipationtestsepositsinSouthwesternOntarioestimatingch.Thelocationoftheporepressurefilterelementinallofthelocation,i.e.,attheshoulderoforclayeysoilsarediscussedandanewempiricalrelationshipis.Abriefoverviewofsomeofthechisalsopresented.Foracomparativeevaluationoftheseatedusingthesemethodsarecomparedtotheverticalcoefficientofconsolidation)estimatedfromlaboratoryoedometertestsperformedonsamplesatcorrespondingdepthsfromnearby

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