煤岩界面粗糙度对超低摩擦效应影响研究

doi:10.13722/j.cnki.jrme.2023.0730

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Abstract To reveal the influence mechanism of coal-rock interface roughness on ultra-low friction rock burst under dynamic load disturbance，a self-designed ultra-low friction test device for coal-rock interface is used. The coal rock block of 1 082 m mining depth in Shenyang Hongyang Three Mine is used as the research object. The coal block is used as the working block，different roughness characteristics of coal-rock interface is simulated by changing the surface roughness of coal blocks. The horizontal displacement of the working block is used to characterize the ultra-low friction effect strength during the impact process. The influence of different roughnesses of coal-rock interface on ultra-low friction effect of coal-rock block under stress wave disturbance is tested. The results show that：(1) under different coal-rock interface roughnesses，the ultra-low friction effect has a frequency sensitivity value. When the disturbance frequency is 2 Hz，the coal-rock interface is more prone to ultra-low friction effects. (2) The disturbance amplitude is linearly positively correlated with the ultra-low friction effect strength. The smaller the coal-rock interface roughness，the greater the horizontal displacement and horizontal acceleration of the working block，and the greater the ultra-low friction effect strength. The greater the coal-rock interface roughness，the greater the increase of the horizontal displacement and acceleration of the working block，and the greater the influence of the disturbance amplitude on the ultra-low friction effect. (3) The roughness only affects the ultra-low friction effect within a certain range，and JRC = 3.81 is the critical value affecting the ultra-low friction effect. (4) The greater the horizontal impact force，the greater the horizontal displacement and horizontal acceleration of the working block，and the greater the ultra-low friction effect strength.

Key words： mining engineering coal-rock interface roughness stress wave disturbance coal rock blocks ultra-low friction effect

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	Articles by authors
	LI Liping1
	HU Xuejin1
	PAN Yishan2
	SUN Yuantao1

Cite this article:

LI Liping1,HU Xuejin1,PAN Yishan2, et al. Study on the influence of coal-rock interface roughness on ultra-low friction effect[J]. , 2024, 43(4): 851-861.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0730 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I4/851

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