Research on the triaxial creep test of unsaturated loess under the matric suction control

For the unsaturated loess, the improved FSR-10 unsaturated triaxial creep testing apparatus is used to perform the triaxial creep test under the condition of the matric suction control. The results indicate that less applied deviatoric stress results in less deformation of the loess, and such deformation is recoverable to some extent. As the deviatoric stress increases, it takes a longer time for soil particles to move to a new position and reach a new balance. When the deviatoric stress increases to a certain degree, it is hard for the particles to move to a balanced state, and the soil sample is damaged. When other conditions are the same, the confining pressure is inversely correlated to the sample deformation, and smaller confining pressure results in a longer time needed for stabilizing the deformation. When the confining pressure and the deviatoric stress are fixed, the deformation of soil is inversely correlated to the matric suction, and smaller matric suction results in a longer time needed for stabilizing the creep curve.