论文部分内容阅读
为研究排气状态对非饱和土固相、液相和气相的分布影响,以排气状态为控制变量,通过不同饱和度、不同干密度的非饱和粘土和粉土的三轴剪切试验,分析了气相对非饱和土变形特性的影响。结果表明,试验过程中非饱和土表现出了明显的剪胀性,不同排气状态下的剪胀程度不同,且排气状态对粘土变形的影响较粉土显著。通过微观机理解释为试验过程中孔隙气压力的增大程度不同,会造成土体颗粒间不平衡力矩的差异性,从而导致剪胀程度的不同。
In order to study the influence of exhaust state on the distribution of solid, liquid and gas phases in unsaturated soils, the exhaust state was taken as the control variable. Through the triaxial shear tests of unsaturated clays and silt with different saturations and dry densities, The influence of gas phase on the deformation characteristics of unsaturated soils is analyzed. The results show that the unsaturated soil shows obvious dilatancy during the test, the degree of dilatancy is different under different exhaust conditions, and the influence of exhaust state on clay deformation is more significant than that of silt. The microscopic mechanism explains that the increase of pore pressure is different during the experiment, which will cause the difference of unbalanced torque between soil particles, which leads to the different degree of dilatation.