利 用大型直剪仪 对土一混 凝土接 触面的应力应变特性进行研究 ,研 究不同法向应力条件下 光滑接触 面的剪切 变形 特性,并构建相应的剪切本构模型。试验结果表明:接触面『一6关系曲线为峰值型,但是随着法向应力的增大,峰值趋势减 缓。光滑接触面剪切破坏强度符合摩尔一库伦破坏强度理论,光滑接触面的黏聚力和摩擦角小于红黏土自身,阐述了接触 面破坏的原 因。通过对光 滑接触 面的剪胀 (缩)特性研 究,发 现存在 区分剪胀和 剪缩的 临界 法向应 力,并给 出了计算 方法 。 此外,探讨直剪试验双曲线模型参数的确定方法,求出适合的双曲线参数,通过该模型可以求得一定法向应力范围内任意 双曲线模型参数。 关键词 :光滑接 触面 ;抗剪 强度 ;本构模 型 ;红黏 土 ;直剪试验 中图分 类号 :TU411.3 文献标志码 :A 文章编号 :1672—7029(2015)04—0795—06 Experimentalstudyofmechanicalbehaviourofred clay soil——concrete smooth interface bydirectsheartest ZENG Weide ,ZHANG Jiasheng ,LONG Yao (1.GuiguangRailwayLimitedLiabilityCompany,Guiyang550015,China; 2.SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China) Abstract:Thispaperutilized the large directshear apparatusforsoiland concrete interface stress and strain characteristicsresearch.The smooth interface shear deformation characteristicsunderthe condition ofdifferent normalstresseswere investigated and the appropriate shear constitutive modelwas buih. Experimentalresults show thattherelationship curve between the Tand 8 ispeak type,butwith the increase ofnormalstress,peak valuetrendingdown.Smooth interface shear strength accordswith Mohr—Coulomb failure strength theory,the contactsurface cohesion and friction angle issmallerthan red clay. Th e cause ofthe shearfailure surface oc— curred in thecontactsurface. Based on research ofthe dilatancy and shrinkage characteristicsofsmooth inter— face,itisfound thatthere existsa criticalnorm alstress which distinguishes shear dilatancy and shrinkage of soil.Moreover,correspondingmethodforcalculatingthe criticalnorm alstresswasproposed.Discussingthedi- rectshear testmethod fordeterm ining themodelparameterofhyperbola,and found outthe suitable hyperbolic parameter. Then any hyperbolicmodelparametersundera range ofnormal stress can be obtained through the mode1. Keywords:smoothinterface;shearstrength;constitutivemodel;redclay;directsheartest
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