关中Q_2黄土流变特性及宏观流变试验研究

为研究关中Q2黄土在不同压应力和含水率下的变形规律,以关中Q2黄土为研究对象,建立了黄土流变模型,对不同压应力和含水量下关中Q2黄土进行宏观流变试验,利用数值分析和力学分析方法对关中Q2黄土在不同压应力和含水率下的流变特性试验数据进行了系统分析,得到了不同压缩荷载和含水率下Q2黄土的流变曲线,给出了考虑含水率和应力影响的分时叠加流变曲线数学模型.试验结果表明:Q2黄土湿陷流变呈两阶段变形,第一段呈现为减速变形,流变曲线呈对数变化,第二段呈现为稳定流变,流变曲线呈线性变化;加载应力与含水率对流变的影响呈正相关,曲线变形趋势一致.

Study on the Rheological Properties and Macro Rheological Test of Guanzhong Loess

In order to study the deformation of loess under different stress and moisture content,the Q2 loess of Guan zhong is taken as the research material.Triaxial creep experiment under different pressure stress and water content is carried.A systematic research is conducted on Q2 loess,through numerical analysis and mechanics analysis,to discover the law of the creep property due to the change in the pressure stress and water content.Considering the impact of moisture and stress,rheological curves superimposed sharing mathematical model is proposed.The rheological curve of Q2 loess which under different compression load and water content is obtained through triaxial rheological test.the results show：The Q2 loess rheological deformation composes two phases.The first phase is deceleration deformation stage in which rheological curve changes logarithmically.In the second phase,change is stable,and rheological curve shows linearly.The impact of loading stress and moisture content on the rheological deformation is positive correlation.The trend of the deformation curve is similar.