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利用后勤工程学院研制的CT-多功能土工三轴仪,研究非饱和原状Q2黄土三轴浸水变形特性,并在浸水过程中利用CT技术对内部结构的变化进行无损的量测,得到内部结构演化的CT图像和相应的CT数据,从细观上解释了三轴浸水过程。基于CT数据定义结构性参数和结构演化变量;分析浸水过程中结构演化变量与净围压、偏应力和吸力的关系,浸水前的固结净围压、偏应力和吸力越大,浸水过程中结构演化越快。建立非饱和原状Q2黄土三轴浸水过程的结构演化方程,该方程为结构演化变量与偏应变、体应变和饱和度增量的关系,能同时反映净围压、偏应力和吸力等对结构演化的影响。利用提出的结构演化方程对试验数据进行拟合,拟合结果较理想。CT技术使土的细观结构研究达到定量阶段,为建立土的结构演化方程和结构性本构模型提供了试验基础。
Using the CT-multi-purpose geotechnical triaxial apparatus developed by Logistic Engineering Institute, the deformation characteristics of unsaturated intact Q2 loess triaxial were studied, and the change of internal structure was measured non-destructively by CT technology in the process of flooding, and the internal structure evolution was obtained CT images and the corresponding CT data, from a microscopic view of the three-axis water immersion process. Based on the CT data, structural parameters and structural evolutionary variables were defined. The relationship between structural evolution variables and net confining pressure, deviatoric stress and suction was analyzed. The net confining pressure, the greater the deviatoric stress and suction, The faster the structure evolves. The structural evolution equation of unsaturated intact Q2 loess triaxial soaking process is established. The equation is the relationship between structural evolution variable and partial strain, volume strain and saturation increment. It can also reflect the effects of net confining pressure, deviatoric stress and suction on structural evolution Impact. Fitting the experimental data with the proposed structural evolution equation, the fitting result is better. CT technology to make the study of the meso-structure of soil reaches the quantitative stage, which provides experimental basis for establishing the structural evolution equation and structural constitutive model of soil.