摘要
首先在控制基质吸力条件下进行了非饱和原状黄土直剪试验,分析了不同含水率下原状黄土剪应力与剪应变关系曲线,在剪应变达到25%时,其基本呈硬化型的。其次,采用邓肯-张模型,得到了原状黄土不同含水率下的(γ/τ)~γ关系曲线,试验结果表明,在同一含水率下,对于某一应变下,随着净法向应力的增大,(γ/τ)值却减小。再次,推导出与初始剪应变和剪切破坏相关的3个参数k、n、Rf,并求出数值。最后,分析了与初始剪应变和剪切破坏相关的3个参数k、n、Rf的变化规律,且随着含水率的增大,n增大,k减小,Rf的试验数据在0.75~0.95之间。
Firstly,the direct shear test of unsaturated undisturbed loess was carried out under the condition of con⁃trolling matrix suction.The relationship between shear stress and shear strain of undisturbed loess under different water content was analyzed.When the shear strain reached 25%,it was basically hardened.Secondly,using Dun⁃can-Chang model,the(γ/τ)~γcurve of undisturbed loess under different water content is obtained.The test re⁃sults show that under the same water content,for a certain strain,with the increase of net normal stress,the(γ/τ)value decreases.Thirdly,three parameters k,n and Rf related to initial shear strain and shear failure are de⁃duced and the values are obtained.Finally,the variation rules of three parameters k,n and Rf related to initial shear strain and shear failure are analyzed.With the increase of water content,n increases and k decreases.The experimental data of Rf are between 0.75 and 0.95.
作者
李小林
宋园园
赵蕊
康旭
LI Xiaolin;SONG Yuanyuan;ZHAO Rui;KANG Xu(Weinan Vocational&Technical College,Weinan 714000,Shannxi China;ChinaDK Comprehensive Engineering Investigation and Design Research Institute Co.,Ltd.,Xi’an 710054,China)
出处
《粘接》
2025年第8期119-122,共4页
Adhesion
基金
陕西省“十四五”教育科学规划2023年度课题(项目编号:SGH23Y3181)
渭南职业技术学院科研计划项目(项目编号:WZYYZ202313)。
关键词
非饱和原状黄土
基质吸力
剪应变
邓肯-张模型
unsaturated undisturbed loess
matric suction
shear strain
Duncan-Chang model
