摘要
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.
采用高频冲击锤开展非爆机械化开采现场试验,研究高频冲击锤在深部硬岩矿山应用的可行性。现场开采试验前,先监测矿体上开挖松动区范围,并从待开采矿柱上取样,进行截齿破岩试验,指导现场采矿试验。采矿试验中高频冲击锤的整体开采效率达到50.6 t/h,开挖卸压槽后开采其上部矿体效率高达158.2 t/h。这表明高频冲击锤在深部硬岩矿山具有良好的应用前景,卸压槽有利于非爆破机械化开采。同时,高频冲击锤还表现出工时利用率高、剥落矿块块度小、粉尘少、开采扰动小等优点。最后,基于现场应用和截齿破岩试验结果,提出基于高频冲击锤的深部硬岩矿山非爆机械化开采方法。
基金
supported by the National Natural Science Foundation of China (Nos. 52174099, 51904333)
the Natural Science Foundation of Hunan Province, China (No. 2021JJ30842)
