APPLICATION OF ENERGY-CONCENTRATED EXPLOSIVE-LOADING METHOD TO CUT PRE SPLIT CRACKS

Compared with conventional pre-split blasting,energy-concentrated explosive loading method to cut pre-split cracks possesses advantages of high blasting efficiency and better control of pre-split crack expansion.Based on analysis of test results and charging mechanis,the new method of energy-concentrated explosive loading to cut pre-split cracks is introduced,and the visco-elasto-plastic fracture model is established.In addition,basic parameters influencing the effectiveness of energy-concentrated explosive loading are optimized.At the end of the paper,the developing direction and application prospect of the new method are pointed out.