The dynamic resilience characteristics of aeolian sand subgrade are influenced by salt content and water content, exhibiting significant stress dependence and anisotropy. The resilient modulus(MR) M R ) of aeolian sand represents the stress-strain nonlinearity under cyclic loading, serving as an important parameter for the design of aeolian sand subgrade in desert areas. In order to investigate the variation of M R of aeolian sand subgrade with salt content and water content under traffic loading, as well as the M R characteristics under these conditions, three types of aeolian sand samples with varying water content and four sulphate contents were prepared. The variation of M R of aeolian sand under different confining pressures and deviator stress levels, as well as the influences of water content and salt content, was studied through indoor dynamic triaxial testing. Based on the pattern of the fitting parameters of the benchmark model, a prediction model suitable for the M R of aeolian sand was constructed. The results indicate a rise in aeolian sand's M R with increasing deviator stress and confining pressure, with confining pressure having a more significant impact than deviator stress. With the increase in water content, the M R of aeolian sand decreases nonlinearly, and with the increase in salt content, it exhibits a wave-shaped trend of increasing-decreasing-increasing, which is related to the dissolution state of sodium sulfate in the soil. Based on the experimental results, a prediction model of the M R of aeolian sand was established, derived from the benchmark model, which can reflect the influence of salt content and water content on the M R , introducing them as variables within the model.

In order to study the soil seasonal dynamic characteristics in the regions with four distinct seasons, the soil dynamic triaxial experiments were conducted by considering the environmental temperature range from -30 degrees C to 30 degrees C. The results demonstrate that the dynamic soil properties in four seasons can change greatly. Firstly, the dynamic triaxial experiments were performed to obtain the dynamic stress-strain curve, elastic modulus, and damping ratio of soil, under different confining pressures and temperatures. Then, the experiments also obtain the dynamic cohesion and internal friction angle of the clay under the initial strain, and the changing rule was summarized. Finally, the results show that the dynamic elastic modulus and dynamic cohesion will increase significantly when the clay is frozen; as the temperature continues to decrease, this increasing trend will gradually slow down, and the dynamic damping ratio will go down when the freezing temperature decreases. In this paper, the change mechanism is objectively analyzed, which verifies the reliability of the conclusions obtained from the experiment.