Abstract:Aiming to the poor quality of using pure rock powder to fill blast holes in Dexing Copper Mine, the feasibility of using air spacers for hole filling is theoretically demonstrated through mechanical calculation and numerical simulation analysis. The theoretical analysis shows that the frictional force provided by an air spacer (18850 N) is greater than the sum of the gravity and frictional force of the packing material lost as a result (16422 N for dry holes and 8426 N for water holes), and the use of spacer packing can prolong the time of explosion stress wave action, resulting in a higher comprehensive stress intensity. Based on this, on-site blasting tests were conducted, and the number and height of punched holes in the blasting area filled with spacers were obviously smaller than those in the comparison area. The efficiency of the electric shovel in the experimental area was increased by 10.4% compared to the comparison area. The results indicate that using spacers for water hole filling can improve resistance to explosive impact, reduce the risk of punching, and improve the blasting effect. Based on the above research, a convenient and low-cost method for filling water holes has been constructed.