Abstract
Fan-pattern long hole blasting is a common method which is widely applied in the sublevel or level mining methods in deposits in which the thickness of ore body is thick and the dip of ore body is steep and the country rocks are comparatively hard. The effect of priming methods on result of ore fragmentation is very important and numerically analyzing its mechanism has a theoretical and practical significance. In this paper, we investigated the damage and fragmentation grain size of ore body in according to the priming methods such as collar, middle and bottom priming by using Ansys Autodyn in detail. The simulation result showed that the producing rate of fine ore and boulder were 9.4% and 36.7% in the collar priming and 5.6%, 26.3% in the middle priming and 5.5% and 23.0 % in bottom priming respectively. This shows that the bottom priming method is more advantageous than the others. The practical design for field application of the fan-pattern long hole blasting was carried out by JKSimblast and the expected result has achieved.
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