Triaxial shear creep characteristics of loess

By taking the samples from a loess slope of Yangling District in Shaanxi Province as the study object, a series of triaxial shear creep tests are carried out to analyze the shear creep characteristics of loess under complex stress condition. Based on the experimental data, the impact of time and deviatoric stress on strain rate is analyzed. An empirical creep model suitable for Yangling District is proposed. It is shown that the model can describe the stress-strain-time relationship with higher accuracy, fewer parameters and easier method of obtaining parameters by the comparison between empirical creep model and experimental data. Besides, under triaxial stress condition, the viscous coefficient is closely related to the deviatoric stress and time. An empirical formula is suggested to simulate the relationship among the viscous coefficient, the deviatoric stress and the time. The verification results prove its applicability and accuracy.