中国矿山工程

There are many advantages in pass drawing, but there are also some hidden dangers which affect its application. When the shaft is filled with ore, the shear stress of the shaft wall can be reduced, and the wear damage caused by collision and rolling on the shaft wall can be eliminated. The friction and wear caused by the shaft filling with ore can eliminate the impact of the unloading ore on the ore in shaft, and the cohesion of the ore in shaft is basically stable, reducing the probability of blockage due to arch forming in the shaft. Pass drawing when the mine shaft is full is an important measure to eliminate hidden danger.