In order to take into account the influence of the crack roughness, first of all, on basis of the calculation model for the rockmass macroscopic damage variable which can take into account the crack geometry parameter, strength parameter and deformation parameter, a calculation model for the rockmass macroscopic damage variable is proposed by introducing the JRC-JCS shear strength model for the rough crack established by Barton, which can consider the crack roughness. Secondly, the proposed calculation model is introduced into the uniaxial compressive dynamic damage model for the rock mass with the non-persistent crack, which both considers the coupling of the macroscopic and microscopic defects, and then a uniaxial compressive dynamic damage model for the rock mass with the non-persistent crack is established which can consider the crack roughness at the same time. Finally, the effect of crack roughness JRC and crack basic friction angle φ_b and crack length 2a on rockmass dynamic mechanical property is studied with the parametric sensitivity analysis. The result shows that the rockmass dynamic climax strength increases from 26.42 MPa to 27.28 and 28.37 MPa with JRC increasing from 0 to 10 and 20 respectively. The rockmass dynamic climax strength increases from 26.24 MPa to 27.28 and 28.80 MPa with φ_b increasing from 0° to 15° and 30° respectively. The rockmass dynamic climax strength decreases from 31.37 MPa to 27.28 and 23.90 MPa with 2a increasing from 1cm to 2 and 3cm respectively. At the same time, in order to describe the influence of the crack roughness more accurately, the crack fractal dimension is introduced into the dynamic damage model for the rock mass, which not only improves the calculation accuracy of the model, but also broadens its application range, which is more convenient for practical engineering application.

A numerical simulation study is performed to investigate the dynamic response and cumulative damage failure mechanisms of an anti-dip layered jointed rock slope in an open-pit mine subjected to cyclic blasting vibrations. First of all, a numerical model of the anti-dip layered jointed rock slope in the open-pit mine is established using the 3 DEC code, building upon prior physical model tests. The simulated dynamic response, failure modes, and slope evolution are compared with experimental results to validate the numerical model' s accuracy. Subsequently, a sensitivity analysis is conducted to examine the effects of bedding and joint surface strength parameters (i.e., cohesion and friction angle) on the slope's permanent displacement and stability. The results indicate that the displacement of monitoring points increases progressively with the number of cyclic blasting events, with a sharp surge upon slope failure. Furthermore, higher bedding and joint surface strength parameters lead to reduced displacement and an increased slope stability coefficient. However, as the number of cyclic blasting events increases, the displacement of monitoring points shows an upward trend, while the stability coefficient gradually declines. These findings offer valuable theoretical insights for the design and construction of anti-dip layered jointed rock slopes subjected to cyclic blasting.