工学类地盘工学特论85955

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1、工学类地盘工学特论85955工学类地盘工学特论.txt本文由defang168贡献ppt文档可能在WAP端浏览体验不佳。建议您优先选择TXT，或下载源文件到本机查看。地盤工学特論第10回Stress,Strain,ElasticityandPlasticity廣岡明彦ahirooka@civil.kyutech.ac.jphttp://geo.civil.kyutech.ac.jp12004/6/23地盤工学特論前回の講義のまとめ前回の講義のまとめ-1粘土の排水せん断強度–エネルギー補正dyτl=τ?σdx(σ1?σ3)l地盤工学特論dε1+2dε3??=(σ1?σ3)+σ3?

2、??dε1??22004/6/23前回の講義のまとめ前回の講義のまとめ-2排水せん断強度σ1f?σ3f=2cdcosφd+(σ1f+σ3f)sinφdφd≒φ′cd≒c′圧密非排水三軸試験で求めたφと圧密排水三軸試験で求めたφdとの比較32004/6/23地盤工学特論前回の講義のまとめ前回の講義のまとめ-3粘土の残留強度一面せん断あるいはリングせん断試験における応力～変位関係の特徴地盤工学特論42004/6/23前回の講義のまとめ前回の講義のまとめ-4Stress,Strain,ElasticityandPlasticitymodel:physicalrepresentatio

3、ninthesenseofascalemodel?aconceptualideaoranumberofmathematicalequationsForSoilsmathematicalmodels:basedontheoriesofelasticity,plasticity,andfrictionCriticalStateModel地盤工学特論SchofieldandWroth,1968AtkinsonandBransby,197852004/6/23前回の講義のまとめ前回の講義のまとめ-5PlainStrainAxialSymmetrySpecialcase:Solidcyl

4、indersofsoilintriaxialtestsσ’2=σ’3δε2=δε3Soil:anaggregateofmineralgrainswithafluidfillingtheporespacesdry;porefluidisairalonesaturated;porefluidiswateralone地盤工学特論62004/6/23前回の講義のまとめ前回の講義のまとめ-6effectivestressσ’=σ–ucontrolssoilbehaviorTheprincipleofeffectivestress(statedbyTerzaghi1936)?Allmeas

5、urableeffectsofachangeofstress,suchascompression,distortion,andachangeofshearingresistance,aredueexclusivelytochangesofeffectivestress.Mathematicalmodelsforsoilbehaviormustbewrittenintermsofeffectivestress,nottotalstress.地盤工学特論72004/6/231.3AnalysisofDeformationandStrainδσ’v,δσ’h:stressincrem

6、entδv,δh:smallchangeofdimensionsModeofdeformation.(a)Stressesonaplaneelement.(b)Continuousstraining.(c)Discontinuousslipping.(b)nodiscontinuitiesintheelement.thebehaviorineachandeverypartoftheelementisthesame.(c)alldeformationsareduetoverylargestrainwithintheslipzone.→SlipPlane(inthelimit,th

7、ezone:zerothickness)(b)and(c)oftenoccursimultaneously，but(b)or(c)usuallypredominates.82004/6/23地盤工学特論Incrementofplanedisplacement(δh)δεx=??x?(δv)δεz=??z1??(δv)?(δh)?δεxz=??+?2??x?z?(δv)?(δh)?+δγxz=2δεxz=????z???xtheengineer’sshearstrain地盤工学特論92004/