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1、黄土各向异性及抗拉本构关系在隧道工程中的应用抗拉强度与粘聚力及无侧限抗压强度之间存在线性关系，由试验结果验证可知，无侧限抗压强度与抗拉强度之比接近13.8，抗拉强度与粘聚力之比接近0.22。隧道塌方分为浅埋整体塌方和深埋局部塌方，前者满足摩尔-库伦理论或广义摩尔-库伦理论，即塌方由抗剪强度不足引起，后者满足最大伸长拉伸线应变理论，即塌方由抗拉强度不足引起。关键词：黄土；各向异性；抗剪强度；抗拉强度；力学特性；隧道塌方论文类型：应用研究II万方数据兰州交通大学硕士学位论文AbstractMeasuretheloessofWang
2、jiagoutunnelonthehorizontaldirectionandverticaldirectionofshearstrengthanisotropyfromYuzhongcounty,Lanzhoucity,throughindoorstraincontrolledtriaxialapparatus.UsingthemethodofUPtomeasurethetensilestrengthofanisotropyonthehorizontalandverticaldirection.Measuretheshear
3、andtensilestrengthofreshapeloessinunderthedifferentdrydensityandwatercontentLanzhouJiuzhou.MeasuretheshearandtensilestrengthofremoldedloessinWangjiagoutunnelandBeiershiliputunnel.Detailedcomparisonandanalysistheanisotropyofshearandtensilestrength.Studywatercontent,d
4、rydensity,cohesiveforce,internalfrictionangle,voidratioandsaturationeffectonthetensilestrengthofloess.Discusswatercontentanddrydensity,cohesiveforceandangleofinternalfriction,voidratioandsaturationundertheactionofthedualfactorssuchasjointeffectonthetensilestrengthof
5、loess,throughTableCuver3Dthree-dimensionaldataprocessingsoftware.DiscusstheapplicabilityofthetraditionalmethodforcalculatingtheUPmethodtomeasuretensilestrengthofloess,basedonthemethodofUPtomeasurethetensilestrengthofsoilandanalysisthesamplefailuremodeformechanicsmec
6、hanism.Inviewofthecharacteristicsoftheloesscollapsibility,analyzingthereasonsoftheeasycollapseaccidentsinloesstunnelsduringexcavationprocess,andexploretheloesstensilestrength’sapplicationinthetunnelcollapseaccidents.Theresultsshowedthatunconfinedcompressivestrength,
7、tensilestrengthandshearstrengthontheverticaldirectionwerehigherthanhorizontaldirection,andtheloessanisotropymodelwassimplifyaselliptical.Theloess’smaximumdeviationstressratioofverticalandhorizontaldirectionwasbiggerunderlowconfiningpressure,reachingto1.35,andsmaller
8、underthehighconfiningpressure,only1.03,indicatingloessanisotropyhadgreaterinfluenceandthedeviationstressandstrainrelationsoftheloessshowed
