Abstract:A non-blasting mechanized mining experiment was carried out with a high-frequency impact hammer, and the daily mining performance was recorded to explore the applicability of the high-frequency impact hammer in deep hard rock mines. Before the field application, the scope of the excavation damage zone was monitored, and rock samples were obtained from the ore body to be mined to carry out a series of laboratory experiments. Field application results show that the overall excavation efficiency reaches 50.6 t/h, and the efficiency of pillar excavation after excavating stress relief slot reaches 158.2 t/h. The results indicate that the non-blasting mechanized mining using high-frequency impact hammer has a good application in deep hard rock mines, and the stress relief slot is conducive to mechanical excavation. In addition, the high-frequency impact hammer also exhibits the advantages of high utilization rate of labor hours, small lumpiness of spalling ore, little dust, and little excavation damage. Finally, according to the field application and laboratory experiment results, a non-blasting mechanized mining method for hard rock mines based on high-frequency impact hammer is proposed.

Key words: hard rock mine; non-blasting mechanized mining; high-frequency impact hammer; excavation damage zone; stress relief slot; mining method