Considering the influence of earth stresses, one-hole blasting of rock under the effect of explosion-induced stress waves is numerically modeled by the Discontinuous Deformation Analysis (DDA) method. It is found that, when the side pressure coefficient of the earth stresses is one, the maximum crack radius and the cracking area decrease with the increase of the initial earth stress level in the model; When the side pressure coefficient is different from one, the major direction of the crack propagations coincides with the maximum compressive principal direction of the earth stresses. The capability restraining and direction guiding effects of the initial earth stresses on the blasting-induced cracks are obviously captured. The numerical simulations reproduce some of the well-known findings observed in rock blasting. This numerical study helps to understand the role of earth stresses in rock blasting and thus have an instructive meaning for practical rock blasting design.

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