河海大学研究生课程高等土力学的课件.pdf

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1、Advancedsoilmechanics•Constitutivelawofsoil•Microstructureofsoil•Strengthofsoil•Consolidationandrheology•SlopestabilityConstitutiveLawofSoilYinZong-ze1.AboutStress-strainRelationship(1)Whatisconstitutivelaw?Stress-strainrelationship(σ−ε)Stress-strain-strengthrelationship(σ−ε−τf)Stress-strain-timer

2、elationship(σ−ε−t)Stress-strain-temperaturerelationship(σ−ε−T)stressstrengthstrain(2)Conventionalcomputationofstress-strainrelationshipofsoils–SimplestressconditionSettlementofbuilding——onedimensionalproblemConfinedcompressiontest,(oedometertest)peCoefficientofscompressionahpelineara∆e=−a∆p−∆ea∆p∆

3、ε=∆ε==v1+e1+ep00nonlineareCompressionindex（指标）∆e=−Cc∆(lgp)ccCc()∆ε=∆lgp1+e0lgp–ComplicatedstressstateEarthdam,undergroundstructure,harbor,excavation,etc.ExtensiveHooke’slaw（linearassumption）σ1⎡1−ν−ν⎤⎢⎥⎧ε1⎫EEE⎧σ1⎫σ⎢−−⎥3⎪⎪ν1ν⎪⎪⎢⎥σ⎨ε2⎬=⎨σ2⎬2⎪⎪⎢EEE⎥⎪⎪ε−−σ⎩3⎭⎢νν1⎥⎩3⎭⎢⎣EEE⎥⎦εacompressσε=aεErεr=−νεaexpan

4、d(3)Stress-straintests–Conventionaltriaxialtestσpiston1capFirst—cellpressureσ3throughwatertoapplyorganicglassThen—deviatorstress3σσ−σ13rubbermembranethroughpistontoapplycylindricalbaseStraincomponentsvεcellεraε–Planestraintestσ1Sampleisenclosedinarubbermembrane,andisputinthecylindricalcell.Cellpre

5、ssure——σ3σ3Axialstress——σ1σ1σ3Dike,dam,retainingwall,nodeformationinlongitudinaldirection—Truetriaxialtestσ1σ3σ2Applyσ1σ2σ3Measureεεε123–HollowedtorsionalsheartestσzMσr2σθσrσr1d1σdθ2Takehalfofringasisolatebodyππ22dd()21σd−d=σcosθdθ−σcosθdθθ21∫r2∫r122ππ−−22τ----fromMσ()d−d=σd−σdzθθ21r22r11σd−σdr22r

6、11σ,σ,σ,τσ=zrzθθθd−d212.DeformationCharacteristicsofSoils(1)Non-linearandnon-elasticσσεεmetalsoilσPlasticstrain—irrecoverablestrain,duetoadjustmentofpositionofgrains.Oneparticlemayslipoveranotherparticle,maydropintoporespace,εpeandtherelativepositionbetweentheεεtwoparticlescannotberecovered.Deform

7、ationcannotberecovered(2)Plasticvolumetricstrainpmetal—noplasticvolumetricstrainεvpsoil—obviousplasticvolumetricstrainεvp•εinducedbypvMacroscopic—compressMicroscopic—slipbetweengrainsppploadingunloadingεvpeεεvvp•