Rheological characteristic of argillaceous weak intercalation under intermittent dynamic shear loads

The cyclic dynamic load is one of the key factors making rock mass be damaged gradually. In order to inves-tigate the influence of blasting vibration on the weak intercalation of rock mass,laboratory experiments were conducted to study the rheological characteristic of argillaceous intercalation under cyclic dynamic load. The static rheological characteristic,cyclic dynamic shearing characteristic and rheological characteristic with dynamic disturbance of speci-mens were comparatively analyzed. The analysis results show that when the specimens were disturbed by intermittent dynamic shearing stress in its rheological process,the dynamic disturbance might have no remarkable influence on the rheological deformation process of the specimens if the initial shearing stress and dynamic shearing stress were compar-atively low. However,low-intensity dynamic disturbance might accelerate the rheological deformation process of the specimens remarkably if the initial shearing stress was close to its shearing strength. There was a stress threshold when the specimen was failure under the static shearing stress and intermittent dynamic shearing stress,which is determined by the sum of static shear stress and dynamic shear stress. For rock slopes controlled by rheological weak structural planes and influenced by long-term blasting vibration,the transient dynamic stability and long-term dynamic stability should be analyzed.