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1、AdvancedsoilmechanicsConstitutivelawofsoilMaterialcomponentsofsoil&classificationStrengthofsoilConsolidationandrheologySlopestabilityConstitutiveLawofSoilYinZong-ze殷宗澤Whatisconstitutivelaw?Stress-strainrelationshipStress-strain-strengthrelationshipStress-strain-timerelat
2、ionshipStress-strain-temperaturerelationshipstrainstressstrength(1)CompressiontestSimplestressconditionSettlementofbuilding——onedimensionalproblemConfinedcompressiontest,(oedometertest)pshepaCoefficientofcompressionVoidratio1.Stress-strainTestslinearnonlineareepCompressi
3、onindex(2)ConventionaltriaxialtestFirst—cellpressuresurroundingpressureconfiningpressureStraincomponentspistonshaftorganicglassbasecylindricalcellrubbermembranecapthroughwaterapplyThen—deviatorstressthroughpistonapplycylindricalsampleComplicatedstressstateEarthdam,underg
4、roundstructure,harbor,excavation,etc.ExtensiveHooke’slaw（linearassumption）expandcompressBoussinesqsolutionadditionalstressSampleisenclosedinarubbermembrane,andisputinthecylindricalcell.Cellpressure——Axialstress——Dike,dam,retainingwall,nodeformationinlongitudinaldirection
5、samplemetal(3)PlanestraintestApplyMeasure(4)TruetriaxialtestM----fromMd1d2Isolativebodyringcolumnshapeprojecttoxaxis(5)Torsionalsheartest（hollowed）2.DeformationCharacteristicsofSoils(1)Non-linearandnon-elasticmetalsoilPlasticstrain—irrecoverablestrain,duetoadjustmentofpo
6、sitionofgrains.Oneparticlemayslipoveranotherparticle,maydropintoporespace,andtherelativepositionbetweenthetwoparticlescannotberecovered.DeformationcannotberecoveredStress–straincurveoftheaftercycleisdifferentfromthebeforeone.Energylost—changeintodeformationenergyAfterman
7、ycycles——elastic(2)Plasticvolumetricstrainmetal—noplasticvolumetricstrain,—verydensemediasoil—obviousplasticvolumetricstrain—porousmediainducedbyploadingpunloadingMacroscopic—compressMicroscopic—slipbetweengrainsinducedbyShearstressPerformtriaxialtestwithp=constantincrea
8、se,butdecreasep=constantp=constantShearcompressionSheardilationp—averagenormalstress,orglobalstressShea
