Abstract: Take the Large-diameter Bunch Deephole Blasting in Dongguashan Copper Mine as an example, different explosive lengths in each hole were simulated. The results show that shock pressure increasing rapidly and the shock wave propagates outside in the form of cylindrical wave at the very beginning of blasting. The blasting load acting on rock in the smash district reach a high value in a short time after the initiation, which leads to the drastic failure of compression. The comparison with the results from parallel long-hole blasting simulation shows that bunch deephole blasting technique will make a much higher maximum stress whose happening time is earlier.  So with the same charge weight, blasting effect of the large-diameter bunch deephole blasting will be better.

Key words: Copper Mine, Bunch deephole blasting, Parallel long-hole blasting, Numerical simulation