一维动静组合加载下磁铁矿石力学特性及破碎特征试验研究

doi:10.13722/j.cnki.jrme.2021.0148

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Abstract To improve the rock crushing efficiency and reducing energy consumption of ore，the dynamic mechanical properties and breakage behaviour of magnetite under one-dimensional coupled dynamic and static loads were studied using the improved Hopkinson pressure bar(SHPB) apparatus. The effects of axial compression ratio and impact velocity on the crushing effect and energy utilization rate of magnetite ore were analysed. Results show that impact velocity mainly affects the impact resistance and crushing degree of magnetite ore. The smaller the sample fragmentation the more significant the influence of axial compression and the larger the cumulative strain，when the axial compression ratio is constant，with impact velocity increasing. The larger the axial compression ratio，the larger the cumulative strain increases. The axial compression ratio mainly affects the damage degree of the inner structure before the dynamic impact and the energy utilization rate of impact load of the magnetite ore. With axial compression ratio increasing，the dynamic compressive strength of magnetite samples has a maximum value. Under one-dimensional combined dynamic and static loading，the crushing effect and energy utilization rate of magnetite ore are controlled by axial compression ratio and impact velocity. The impact resistance of magnetite ore is enhanced by“low axial compression + high velocity”. The compression and shear effect of“high axial compression + low velocity”is not significant and the crushing effect is poor. “High axial compression + high velocity”makes the sample broken into a large number of debris powder，which has good crushing effect with low energy utilization rate. When the“extrusion + impact”rock breaking method is used to improve the crushing effect and energy utilization rate of magnetite ore，the optimal combination of axial compression ratio and impact velocity should be put forward on the premise of clear crushing fragmentation requirements and considering the combined effect of axial compression ratio and impact velocity comprehensively.

Key words： rock mechanics magnetite one-dimensional coupled dynamic and static loads axial compression ratio dynamic mechanical property broken characteristics

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	Articles by authors
	LIU Zhiyi1
	2
	GAN Deqing1
	2
	YU Zehao1
	2
	TIAN Xiaoxi1
	2
	WANG Ling1
	2

Cite this article:

LIU Zhiyi1,2,GAN Deqing1, et al. Experimental research on the dynamic mechanical properties and breakage behavior of magnetite under one-dimensional coupled dynamic and static loads[J]. , 2022, 41(S1): 2869-2880.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0148 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2869

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