The Research Of Decreasing Multi-row And Simultaneity Blasting Technology Of Underground Metal Mine

Middle-deep hole blasting technology is usually employed in underground metal mining. The difficult part of this technology focuses on several practical problems such as how to improve the equality of blasting block,how to decrease the consumption of explosive factor and blasting equipment and how to reduce the rate of lost mineral block. Concerning this,"the blasting technology of progressive decreasing multi-row and simultaneity" is presented.On the basis of modern blasting theories,the moving process of explosive stress field of multi-row and simultaneity is analyzed and the characteristics of stress field inspired by equivalent effect cell of globosity charge in cylindrical charge structure are considered. Thus energy distributing equation of detonator explosion is established and the explosive energy utilizing rate factors are known. So the moving process model of the hole filling is constructed and the equation of calculating reasonable filling length is produced. On the basis of theory analysis and a number of spot experiments,the blasting technology of progressive decreasing multi-row and simultaneity is presented and the best blasting parameters are obtained.