筑壩堆石料應力路徑本構關系研究.pdf

1、大連理工大學博士學位論文筑壩堆石料應力路徑本構關系研究姓名：相彪申請學位級別：博士專業(yè)：水工結構工程指導教師：林皋遲世春20090601筑壩堆石料應力路徑本構關系研究StudyonConstitutiveRelationsofDamRockfillConsideringtheEffectofStressPathAbstractRockfill，asacommonconstructionmaterialincivilengineering

2、，iswidelyusedintheearthrockdamengineeringforitsadvantagesofhighstrengthgoodcompactibilitylowcostandstablepropertiesWimtheincreasingofdesignheightinearthrockdam，thestressstateofrocldillbecomesmorecomplex，andthestressstrai

3、nrelationsofrockfiUhavealreadybecomeoneofthebasicpropertiesthatmustbedeeplyunderstoodintheengineeringdesignAtpresentthelaboratorytestsareusuallyconductedintriaxialshearstatewi也constantconfiningpressureuntilthesamplesreac

4、hthefailurestate，thestresspathofwhichisquitedifferentfromthatofrockfillduringdamconstructionandreservoirfilling，andtheresultsinthestress—strainanalysisofdambodyusingthecalculatingconstitutivemodelproposedbytriaxialtestre

5、sultshavedifferenceswitllthemeasureddatainsomedegreenemainreasonoftheproblemisthattheconstitutivemodeladoptedcallnotfullytaketheeffectofstresspathintoaceountBasedontheaboveproblems，thepapercarriesoutthestudyonconstitutiv

6、erelationsofdamrockfillconsideringtheeffectofstresspathThemainworkisasfollows：(1)TheengineeringcharacteristicsofcoarsegrainedsoilalestudiedBasedonthelatestresearchonstresspathsummarized，thenecessityofstudyingonthestressp

7、athconstitutivemodelofrockfillistobeconsideredForsimulatingtheactualstresspathofdamrockfill，drainedtriaxialtestsundertwotypesofstresspathareintroduced，whicharethestresspathsofconstantstresratioduringdamconstructionandthe

8、transitionalstresspathsuponreservoirfillingAccordingtothemeasuredstress—strainrelationcurves，thestressanddeformationcharacteristicsofrockfillunderdifferentformsofstresspathareanalyzedindetail(2)Employingthemethodofdecoup

9、linganalysisonstrainvariable，thecouplingeffectsofmeanprincipalstressPandshearstressqaretakenintoaccountOnthepremiseofconsideringpracticalapplication，theincrementallynonlinearmodelsofrockfillunderthestresspathsofconstants

10、tressratioincludingfourmodulusandthreemodulusareproposedrespectivelyThetwoproposedmodelsaresuitablefordescribingthestressstrainrelationsofrockfillunderthepathsofconstantstressratio(3)Basedonthestress—pathtestresultsofroc