Abstract
It is of great importance to study the proper rock blasting damage constitutive model for the design of rock blasting excavation parameters and the damage assessment of retained rock. Therefore, on the basis of the classic KUS rock damage constitutive model which only involved tensile damage, considering the compression-shear damage of rock near the explosion source caused by extensive blasting load, an improved rock blasting damage constitutive model is established. Meanwhile, the distribution of rock damage zone of a single blasthole is calculated by dynamic finite element software based on the improved model, and the results show that the ratio of crushing zone radius to cartridge radius is between 4.3 and 4.6 under different charging radius, while the ratio of fracture zone radius to cartridge radius is between 78.9 and 83.8, which is close to the existing research results. Thus, the accuracy of the established constitutive model of rock blasting damage is verified.
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