The slip characteristics of gravel under periodic shear stress
In order to study the sliding characteristics of gravel materials under cyclic shear load, a self-developed multi-functional dynamic shear testing machine was used to apply constant normal stress and horizontal cyclic shear stress with different peak, valley and frequency to the gravel samples, and to monitor the change of shear displacement of the samples over time during loading. The change of shear displacement increment and the energy density corresponding to shear stress during the whole loading period are analyzed. The results show that the characteristics of slip induced by cyclic shear stress are related to its peak value, valley value and frequency. The periodic shear stress will lead to the slip jump of the gravel material, and the condition of the slip jump point is related to the energy density during the loading period. According to the range of energy density, the slip state of the sample can be divided into three regions, the stable region, the transition region and the jump region.