Abstract
One of the most critical complications of blasting in open-pit mines is blast-induced damage such as back break, which affects various aspects of safety and economy. Recognizing the effective parameters and predicting the amount of blast-induced damage can lead to reduce and prevent it. Therefore, several studies have been conducted on the effects of various parameters such as discontinuities conditions, host environment, and rock physical and mechanical properties on blast-induced damage. However, the effects of parameters such as discontinuity orientation, delay time, and different blasting patterns have been less studied due to the complexity of their modeling. In the present study, the effects of the various delay times, the square and stagger blasting patterns, and discontinuity orientation on blast-induced damage are investigated using numerical modeling. Finally, to assess the capability of different behavioral models to numerically simulate the blast-induced damage zone (back break), the Cohesion Weakening Friction Strengthening (CWFS) models were implemented and compared with the perfect plastic model. The results showed that although the delay time reduces the damage and vibration, very high delay time values are not effective. Also, some vibration frequencies have very low amplitudes in models in which the delay is applied. A comparison of square and stagger patterns showed that the possibility of damage is higher in the stagger pattern, but the vibration is almost the same at the far-field from blasting. Comparing the back break extension of the Calamine mine with the results of the perfect plastic and the CWFS models shows that the CWFS model predicts relatively more accurate.
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Aftabi, M., Molladavoodi, H. Numerical analysis of parameters influencing blast damage and vibration using 3D distinct element method in the Calamine mine. Arab J Geosci 17, 79 (2024). https://doi.org/10.1007/s12517-023-11848-6
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DOI: https://doi.org/10.1007/s12517-023-11848-6