Abstract:Natural caving method mines are generally thick ore bodies, the horizontal area of the bottom pulling is large, the vein penetration is long, if the cutting along the vein is not used, it is easy to cause the horizontal loosening of the bottom pulling ore transportation distance is long, ventilation is difficult. Under the superposition of supporting pressure and lateral bearing pressure, a high-stress concentration area is formed at the intersection of the bottom and the roadway along the vein, which has a great influence on the blasting quality of the bottom pull. In order to improve the blasting quality of the bottom over the vein and protect the stability of the bottom structure, this paper analyzes whether a mine has a cutting shaft and has a cutting shaft along the vein, and determines that the blasting effect of the cutting well along the vein under high stress is better, which can effectively change the minimum resistance line of blasting, increase the blasting free surface, reduce the single consumption of explosives, improve the charge coefficient, improve the quality of the bottom blasting along the vein, and effectively protect the stability of the bottom structure.
