飽和多孔介質的混合元法.pdf

1、大連理工大學碩士學位論文飽和多孔介質的混合元法姓名：嚴穎申請學位級別：碩士專業(yè)：固體力學指導教師：李錫夔20000601大連理工大學碩士學位論文摘要AbstractAfour—nodemixedstrainelementwitlloneintegrationDoiIltiSdevelopedforsimulmingoftheconsolidationandtheseepageinsaturatedsoilTheupformequatio

2、nsofseepage—dynamicandseepageconsolidationareformulatedonthebasisoftheHuWashiZUprincipleDruckerPragerassociate／non—associateyieldcriterioniSadoptedtomodelthemateriallynonlinearbehavioroftheskeletonofthesoil；Simultaneousl

3、y，acorotationalformulationderivedbvJetteurandCescottoiSadoptedtoanalysegeometricallynonlinearproblemsForpressuredependentelastoplasticmaterials，theeffectsofboththedeviatoricandthevolumetricplasticdeformationsariseintheth

4、reenormalstress(swain)componentsConsequentlytheconsistentelementformulationformateriallynonlinearanalysis，includingelementconsistenttangentmodulusmatrixandthereturnmappingalgorithmfortherateconstitutiveequationoftheeleme

5、ntcannotbeanalyticallyderivedinaconciseformToovercomethiswewiIlinwoducethesocallednatl2ralco—ordinatesysteminthestress(strain)space，nlenaturalCO—ordinatesaredefinedinsuchawaythatthedeviatoricandhydrostaticcomponentsofthe

6、normalsaess(strain)componentsaresplkDuetothetransformationoftheclassicalnormalstressandstrainvectorsintothecomponentsreferredtothenattnalcoordinateswhichmorereadilydescribethestress(strain)invariants，theconsistentelement

7、formulationisanalyticallyderivedNonlinearsolutionsubroutinesfortheelementareaddedtothelargefiniteelementanalysisprogramLagamineNumericalexamplesaregiventodemonsWatetheperformanceofthemixedelementmethodpresentedinthePaDer

8、TheflEtherimprovementrequiredisbrieflydiscussedattheendofthepaperKeyword：saturatedsoil，mixedseepagedynamic，staindemen：t，oneintegrationpoint，seepageconsolidationcorotationalformulationpressuredependent，uaturalcoordinates，