Characteristics of dynamic shear strength of Xiji loess under different design intensities

In order to investigate the dynamic shear strength characteristics of Xiji loess under different design intensities and to compare the differences between dynamic and static strengths, the indoor dynamic strength tests and direct shear tests are conducted. The aim is to analyze the impact of dynamic and static loads on the internal friction angle and cohesion. The test results show that the dynamic cohesion C_\textd and the internal friction angle \varphi _\textd of loess exhibit a decreasing trend with an increase in the design intensity. Additionally, the loess with a high sand content may experience a slight increase in the cohesion C_\textd . The values of C_\textd and \varphi _\textd under dynamic loads are smaller than the results obtained from the direct shear tests, and the difference in C is more pronounced. For the Xiji loess, this study presents a method for determining the dynamic strength parameters under various loading conditions using the direct shear tests.