单轴受压下水泥土全应力-应变关系曲线研究  

Whole Stress-Strain Relationship of Cement Soil under Uniaxial Compression

作　　者：周海龙[1] 申向东[1] 薛慧君[1] 樊浩伦 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,呼和浩特010018

出　　处：《硅酸盐通报》2015年第9期2674-2680,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51069008);教育部创新团队发展计划(IRT13069);内蒙古自治区自然科学基金项目(2013MS0720)

摘　　要：为研究水泥土的力学性能和方便工程应用,采用内蒙古黄河灌区周边典型的粉质土配制水泥土,并进行了不同水泥掺入比5%,10%,15%和20%,不同养护龄期7 d、14 d、21 d、28 d、60 d和90 d下的无侧限抗压强度室内试验,得到了大量应力-应变关系曲线。通过采用Matlab可视化曲线拟合工具界面cftool进行分析,建立了一种全新的水泥土应力-应变关系的非线性模型,该模型采用logistic函数拟合曲线的上升段,采用复合双曲线函数拟合曲线的下降段。研究结果表明:该非线性模型简单实用,能够很好地与试验数据进行吻合,并较传统的非线性模型拟合效果更好。To research on the mechanical properties of cement soil and be convenient to engineering application, cement soil were prepared by the typical silty soil and Portland cement which is widely distributed in the Yellow River irrigation located in Inner Mongolia autonomous region. A series of laboratory tests for the cement soft were carried out considering the factors such as cement mixing ratio （5% ,10% ,15% and 20% ） and curing age（7 d,14 d,21 d,28 d,60 d and 90 d） , and many of stressstrain relationship curves were obtained. Through analyzing by using the visualization curve fitted tools interface cftool in Matlab, a new type of stress-strain relationship nonlinear model was built, which was made of upward section and downward section, the upward section was fitted by logistic function, and the downward section was fitted by composite hyperbolic function. The result showed that this nonlinear model was simple and practical, fitted experimental data well, and better fitted than traditional nonlinear model.

关 键 词：单轴受压 水泥土 应力-应变关系 logistic函数 非线性模型 

分 类 号：TU502[建筑科学—建筑技术科学]