Optimizing the blast fragmentation quality of discontinuous rock mass: Case study of Jebel Bouzegza Open-Cast Mine, North Algeria

Abstract

Purpose. The research aims to investigate the impact of discontinuity characteristics, including dip direction, dip and joint spacing, on the size distribution of blasted fragments in mines and quarries. The accuracy of blasting results is essential for efficient operations, and understanding these factors can enhance blast fragmentation outcomes. Methods. We conducted our research at the Jebel Bouzegza C01 aggregate quarry, analyzing eight blast benches. To determine fragment sizes, we employed image processing tools to calculate P50, P80, and Pmax sizes. Additionally, we used the Kuz Ram model to predict the average size (X50) and the percentage of oversize fragments (Pmax). The determination coefficient (R²) is calculated for both methods to assess their correlations with dip direction. Findings. Our analysis revealed significant findings related to the impact of discontinuity characteristics on fragment size distribution. The dip direction exhibits the strongest correlation of Pmax size when using Split Desktop and X50, as well as Pmax% with the Kuz Ram model. Joint spacing also plays a role in influencing blast fragmentation outcomes, although its effect depends on the infill materials. Originality. This research contributes to the understanding of factors affecting blast fragmentation outcomes. The research focuses on dip direction, dip and joint spacing characteristics, and adds to existing knowledge in this field. Practical implications. The findings of this research have practical implications for mines and quarries, offering valuable guidance for site investigations and optimization of blasting practices. By assessing properties such as dip direction and joint spacing, blasting operations can be enhanced to achieve more efficient and accurate results.