Improvement and performance analysis of constitutive model for rock blasting damage simulation

Through a series of numerical simulations on single-hole blasting and presplit blasting, this paper analyzed the performance differences of the Riedel-Hiermaier-Thomal (RHT) and Holmquist-Johnson-Cook (HJC) constitutive models in simulating the blasting crack propagation of rock under different in-situ stress environments. Firstly, the RHT model parameters for granite were determined through mechanical experiments. Then, the traditional HJC model was improved by introducing failure criterion, and the practicability of the above two models in simulating blasting cracks was verified. Finally, the performance differences between these two models were analyzed in simulating blasting cracks of deep rocks. The results indicate that the improved HJC model is consistent with the RHT model in characterizing the blasting cracks of shallow rock. As the burial depth increases, the RHT model can accurately simulate the propagation of cracks in the entire blasting area under different in-situ stress conditions, while the improved HJC model can only simulate the crushed zone generated by blasting well. In addition, the improved HJC model behaves poorly in terms of general applicability because the specific failure criterion cannot be applied to multiple scenarios. These findings can offer valuable references to deep rock blasting simulations.