Mechanical response of structural rock slope under cyclic dynamic disturbance

Abstract

In order to study the stability of slopes containing weakly inter bedded rocks under dynamic disturbance, the dynamic response characteristics of rocks with different inclinations under dynamic cyclic disturbance are investigated through indoor experiments on rock specimens with different inclinations and the construction of a dynamic model of the structural surface of the rock body under dynamic disturbance. The results show that the stress-strain curve under cyclic disturbance is a closed hysteresis loop curve, and its general stage is characterized by: sparse-dense-sparse; when the disturbance amplitude is constant, the rock deformation increases with the increase of inclination angle. For the rock specimen with the same inclination angle under the same static load stress, there is a disturbance threshold for the disturbance destructive stress amplitude of the rock structural surface. In the case that the disturbance amplitude is less than this threshold, the plastic deformation of the rock body is relatively stable. Once the perturbation amplitude exceeds the threshold, the structural surface of the specimen is damaged and the plastic deformation is destabilized, which is manifested by the S-shaped curve of the plastic accumulation and the number of cycles. It is shown that when the inclination angle of the structural face is greater than 30°, the damage of the structural face is not only material damage, but also shear damage occurs at the junction position of the structural face of the rock body, leading to the destabilization of the entire structural face of the rock system.

Keywords

• stability of slope
• dynamic disturbance
• contained weakly inter bedded rocks
• rock structural surfaces
• hysteresis loop
• disturbance threshold