Abstract: Single-hole blasting damage models were established by using HJC (Holmquist-Johnson-Cook) model and RHT (Randomized Hough Transform) model respectively for comparison to study the dynamic response of rock mass blasting in the vicinity of the blast hole of hydropower engineering slope under different damage models.The blasting damage distribution,the seismic wave energy characteristics,and the threshold of damage particle peak vibration velocity (PPV) of rock mass under the two models were investigated based on the simulation result and calculation analysis.The results demonstrated that the blasting cracked area in the RHT model is approximately twice that of the HJC model under the same working condition.The smaller the damage range,the greater the proportion of explosive shock wave transformed to elastic vibration wave.The damage PPV thresholds of HJC model and RHT model were obtained by fitting the relationship between damage degree and PPV as 13.09 cm/s and 27.29 cm/s,respectively.In conclusion,the RHT model reflects more accurately the blasting damage effect of rock mass in the vicinity of actual slope.

Key words: blast hole of slope, numerical simulation, damage model, dynamic response, damage characteristics