To reveal the influence mechanism of bursting tendency of coal-rock combination on ultra-low friction-type rockburst,the bursting tendency of the combined coal-rock specimens tendency of was measured,and then the self-developed ultra-low friction test apparatus of coal-rock interface was used to explore the relationship between the bursting tendency of coal-rock combination and the disturbance frequency and amplitude of vertical stress wave by analyzing the horizontal displacement,kinetic energy and friction force. The results show that under the influence of disturbance frequency,the significant influence areas of frequency on the ultra-low friction are 2.0-3.0Hz and 2.5-3.5 Hz of weak and strong bursting tendency coal-rock samples,respectively. With the increase of bursting tendency,the frequency significant influence area gradually shifts to the right. Compared with the weak bursting tendency coal-rock specimen,the horizontal displacement and kinetic energy of the strong bursting tenden-cy coal-rock specimen are larger and the friction force decreases greatly,favoring ultra-low friction sliding. With the increase of the residual energy index of the coal-rock specimen,the degree of bursting tendency increases and the kinetic energy increases following the exponential law,more easily triggering ultra-low friction sliding. The research results can provide reference for the prevention and early warning of ultra-low friction-type rockburst.
关键词
煤岩组合体/冲击倾向性/剩余能量指数/煤岩界面/超低摩擦型冲击地压
Key words
combined coal-rock/bursting tendency/residual energy index/coal-rock interface/ultra-low frictiontyped rockburst
维普
万方数据