Abstract:In order to explore the impact load caused by blasting in the mining process of Pulang Copper Mine for the dynamic mechanical properties of two kinds of ore rocks and the change law of crushing energy during blasting, the impact test of two kinds of ore rocks under different loads was carried out by SHPB test device, and the dynamic compressive strength and energy change law of two kinds of ore rocks were analyzed. The test results show that with the increase of strain rate, the dynamic compressive strength of the two rocks increases in a power function. Compared with B-type ore, A-type ore shows higher dynamic compressive strength, and the difference between them increases with the increase of strain rate. Among them, the dynamic compressive strength of type A ore increased by 264.32 %, and the dynamic compressive strength of type B specimen increased by 210.73 %. The unit volume absorption energy of type A ore increases more than that of type B rock with the increase of strain rate. The analysis of the distribution of fragments after crushing of the two ores shows that the fractal dimension of the B-type ore is higher as a whole. The research results provide an important theoretical basis for the long-term and stable safety production of mines and the selection of blasting schemes.

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