資源描述：
《考慮土結(jié)構(gòu)性和各向異性影響天然沉積軟粘土本構(gòu)關(guān)系地研究》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、摘要本文在修正劍橋模型的基礎(chǔ)上提出了一個物理意義明確、參數(shù)易于確定、計(jì)算比較簡單，并且能夠較為合理地模擬天然沉積土壓縮系數(shù)隨應(yīng)力水平變化和各向異性導(dǎo)致屈服面傾斜的天然沉積軟粘土的彈塑性模型。論文的主要：l：作和創(chuàng)新點(diǎn)如下：1)基于天然沉積軟粘土的壓縮特性，提出了天然沉積軟粘_十的lnv—lnP’雙線性壓縮模型，建立了可以定量描述天然沉積軟粘土壓縮曲線的數(shù)學(xué)表達(dá)式，并采用對數(shù)應(yīng)變形式，將目前被土力學(xué)模型廣泛應(yīng)用的小變形彈塑性理論發(fā)展到有限變形理論之中，彌補(bǔ)了小變形彈塑性理論預(yù)測士體變形時的缺陷。2)提出結(jié)構(gòu)性參數(shù)比來反映天然沉積軟粘七在受力過程中應(yīng)力面的位置，描
2、述結(jié)構(gòu)性喪失的過程。3)結(jié)合前人構(gòu)建正常屈服面／結(jié)構(gòu)屈服面二應(yīng)力邊界面模型的思路，考慮硬化規(guī)則中塑性體積變形和剪切變形的共同影響，通過本文提出的雙線性壓縮模型給出了天然沉積軟粘土各向異性的有限變形硬化規(guī)律，提出一個考慮天然沉積軟粘土特性的彈塑性模型；4)選取了典型的江蘇連云港軟粘土和Bothkennar軟粘土為對象，通過與已有的試驗(yàn)數(shù)據(jù)比較，驗(yàn)證采用本文提出的天然沉積軟粘士模型進(jìn)行模擬計(jì)算的合理性和有效性。關(guān)鍵詞：天然沉積軟粘土；雙線性壓縮模型；各向異性；本構(gòu)關(guān)系；修正劍橋模型AbstractSoilstructureandanisotropyaretwoes
3、sentialfactorsforestablishingtheelasto—plasticconstitutivemodelfornaturallystructuredsoftclays．BasedOiltheModifiedCamClay,thisstudyproposesanewconstitutivemodelofnaturalsoftclaysthroughconsideringthechangeincompressibilitywithstresslevelandtheinitiallyinclinedyieldsurfaceduetoanisot
4、ropy．Basedonthebehaviourofnaturalsoftclaysunderone—dimensionalcompression，adouble-linecompressionmodelisproposedbyincorporatingthelinearrelationbetweenbothlogarithmsofthevolumeandmaineffectivepressure．Couplingwiththedouble-linecompressionmodel，adoubleinclinedyieldingsurface(normalyi
5、eldsurface／structureyieldsurface)，ofwhichthemethodisoftenusedinthemulti—boundarysurfacemodel，isadoptedaswellasanewparameterCisproposedtodescribethedestructurationofthenaturalsoil．Consideringbothplasticvolumestainandplasticshearstainhardening,Thehardeningrulepertinenttotheanisotropyy
6、ieldsurfaceisproposedbasedonthedouble—linecompressionmodelinanaccuratefinitedeformationelasto—plastictheory,whichdoesn’thaveanyunrealisticpropertiesinthetraditioninducedbytheinfinitesimaldeformationeaisto—plastictheory．Significantimprovementsweredemonstratedintheperformanceofthenewm
7、odeloverthetraditionalconstitutivemodelsinthemodelingofmanyimportantfeaturesofthebehaviorofnaturalsoftclayswiththetriaxiaiexperimentaldataofLianYunGangsoftclaysandBothkennarclays．Keywords：naturalstructuredsoftclays；adouble—linecompressionmodel；anisotropy；ModifiedCamClayII東南大學(xué)學(xué)位論文獨(dú)創(chuàng)性
8、聲明本人聲明所呈交的學(xué)位論文是我個人在
