摘要
利用全自动三轴仪,对南京地区典型的粉土、粉质黏土试样进行了固结不排水剪试验.研究具有剪切带性状试样的有效主应力比、孔隙水压力、偏应力随轴向应变的变化关系,简要分析了剪切带产生后的破坏形态、影响因素、应力-应变特性及软化特性.试验表明:具有剪切带性状的试样表现出单一型、"X"交叉型、单一局部型、两条平行型4种剪切破坏类型,同时偏应力、有效主应力比随应变变化的关系曲线具有明显的非线性,材料的剪胀性、结构的不均匀性是剪切带产生的基本条件.
The undrained shear tests on silt and silty clay in Nanjing were conducted by the KTG triaxial apparatus to research relationships of effective principal stress ratio, pore water pressure, and deviatoric stress with axial strain change of specimens with shear band, and to analyze failure pattern, influencing factors, stress-strain porformance and softening characteristics. The experimental analysis shows that, triaxial test specimens with shear band behavior have four shear failure patterns： single shear, X-type cross shear, single local shear, and two parallel shear bands. The stress-strain relationships and effective principal stress ratio-strain curves are obviously nonlinear. Dilation and structural imperfection are the basic factors of shear band formation.
出处
《南京工业大学学报（自然科学版）》
CAS
2008年第5期7-11,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省高校自然科学基金资助项目(01KJB410001)
关键词
剪切带
三轴压缩试验
应变局部化
破坏形态
shear band
triaxial compression test
strain localization
failure pattern
