课程难点复习资料 太沙基一维固结理论

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1、1-25-00,SettlementandConsolidationRef:PrinciplesofGeotechnicalEngineering,BrajaM.Das,1994CoastalEngineeringHandbook,J.B.Herbich,1991Topics:EffectiveStressCompressionandConsolidationProcessSettlementCategoriesPreconsolidationConditionCalculationofPrimaryConsolidationSettlementTimeRateofC

2、onsolidation---------------------------------------------------------------------------------------------------------------------EffectiveStressTotalstressatpointAbelowthesoilsurfaceisequalto(1)thestresscarriedbythewaterinthecontinuousvoidspaces(i.e.porewaterpressure,u)and(2)thestressca

3、rriedbythesoilsolidsattheirpointsofcontact(i.e.thesoilskeleton).Approximatelytheeffectivestress(')HHHwAsatHHWWAswwheresatVtotal'u1awhereaisthefractionalsurfaceareaofsolids(usuallya<<1forallApracticalconditions)so'urearrangingandsubtractingtheporepressure(uH,i.

4、e.hydrostaticpressure)AwHHHHHH,wherewAsatAwAwCompressionofsoillayersduetostressincreasebyconstructionoffoundationsorotherloads.Compressioniscausedby:1.Deformationofsoilparticles2.Relocationofsoilparticles3.ExpulsionofwaterorairfromvoidspacesConsolidation-Process

5、thereductionofbulksoilvolumeunderloadingduetoflowofporewater.Forsaturatedsoils,anyincrementofloading(,calledsurcharge)willbeinitiallytakenupbytheporepressureandresultinconsolidationuntilanewequilibriumisreachedwherethesoilsolids(orskeleton)takesuptheaddedload.surcharge:'uForcoh

6、esivesoils:att=0,u;t=,'Fornon-cohesivesoils:waterdrainsfasterandtheloadistransferredimmediatelyCategories:1.Immediatesettlement-elasticdeformationofdrysoilandmoistandsaturatedsoilswithoutchangetomoisturecontenta.duetohighpermeability,porepressureinclayssupporttheentireaddedloa

7、dandnoimmediatesettlementoccursb.generally,duetotheconstructionprocess,immediatesettlementisnotimportant2.Primaryconsolidationsettlement-volumechangeinsaturatedcohesivesoilsbecauseoftheexpulsionofwaterfromvoidspacesa.highpermeabilityofsandy,cohesionlesssoilsresultinnearimmediat