2016 年 4 巻 2 号 p. 23-26
We present a numerical model to simulate blast induced vibration propagation. The model applies normal pressure to the walls of a cavity, which represents the fractured zone formed by the blasting. The material damping is modeled using the Rayleigh damping formulation. The model is verified through comparisons with two sets of analytical solutions. The comparisons demonstrate that the numerical model accurately predicts the attenuation both at near-field and far-field. The near-field attenuation is not greatly influenced by the damping, whereas the far-field vibration is dependent on the material damping. The far-field attenuation also is shown to be sensitive to the frequencies selected for the Rayleigh damping formulation. We propose a procedure to select optimum frequencies for the Rayleigh damping formulation. The proposed numerical model can be used to estimate the dynamic response nearby structures, as well as to develop site-specific source-to-site attenuation relationship.
