摘要
选取江苏宿迁地区的粉土为研究对象,采用聚丙烯酰胺和硅酸钠对其进行改性,分别对粉土和改性粉土进行常规三轴压缩试验(CTC)、等压压缩试验(TC)和减压压缩试验(RTC)的研究,对比改性前后粉土的变形特性。研究结果表明:应力路径对粉土及改性粉土的力学特性均产生影响,同一围压下,常规三轴应力路径下的偏应力最大,等压压缩应力路径次之,减压压缩应力路径最小,应力-应变曲线均呈非线性变化;相同应力路径、相同围压、改性粉土与粉土相比,偏应力有不同程度的提高;采用软化模型和邓肯-张模型对粉土及改性粉土进行应力-应变关系曲线模拟,拟合效果较好,而且模型参数因函数模型、应力路径、围压而各不相同。
The silty soil in Suqian,Jiangsu province,is selected as the research object,which was modified by polyacrylamide and sodium silicate. Conventional triaxial compression tests（ CTC） 、tri-axial compression tests（ TC） 、reduced tri-axial compression tests（ RTC） had been carried out to analyze the deformation characteristics of silty soil and polymer material modified silty soil. The test results show that the deformation characteristics of pure silty soil and polymer material modified silty soil are affected by the stress path. The value of partial stress decreases in the order of CTC,TC,RTC under the same confining pressure,and the stress-strain curve is nonlinear. In the condition of same confining pressure,and stress path,the partial stress of the polymer materials modified silty soil increases compared to silty soil. The strain-softening model and the Duncan-Chang model are adopted to simulate the stress-strain curves. The results show that both of them are excellent in fitting. The fitting parameters reflect on different function models,stress paths,and confining pressures.
作者
陈凡
董金梅
朱华
CHEN Fan;DONG Jinmei;ZHU Hua(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;Nanjing Dongda Geotecnical Engineering Co.Ltd.,Nanjing 210018,China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2018年第4期78-85,共8页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(51108236)
关键词
粉土
改性粉土
应力路径
应力-应变曲线
silty soil
polymer material modified silty soil
stress path
stress-strain curve
