Abstract: In actual blasting engineering, the charge is in an eccentric uncoupled position relative to the blast hole due to its own weight. Under this charge structure, the distribution of blasting load on the rock mass near the blast hole is not uniform, resulting in differences in the explosion energy and damage evolution distribution near the blast hole. In this paper, based on numerical simulation software, the HJC model and the RHT model are used to establish rock single-hole blasting structure, and the effects of different models on the blasting dynamic response and damage characteristics of the eccentric uncoupled charge rock mass are investigated. The results show that simulation environment based on this paper, under the condition of concentric uncoupled charge, the degree of damage around the hole is basically the same, However, the range of damage under the RHT model is nearly twice as large as under the HJC model; with the increase of the eccentricity coefficient, the damage of the HJC model is biased toward the coupled side of the hole, and Uneven distribution of in the range of blasting damage between the coupled and uncoupled sides of the RHT modeled borehole; The RHT model can more accurately present the expansion pattern of rock cracks in actual blasting projects.

Key words: numerical simulation, eccentric uncoupling, damage model, blasting load, extent of damage