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为揭示煤岩组合体冲击倾向性程度对超低摩擦型冲击地压的影响机制，以不同冲击倾向性煤岩组合体为研究对象，在对煤岩组合试件进行冲击倾向性测定的基础上，采用自行研制的煤岩界面超低摩擦试验装置，以发生超低摩擦效应时的水平位移、动能、摩擦力为指标，探究煤岩组合体冲击倾向性与垂直应力波扰动频率、扰动振幅之间的关系特征。研究结果表明：(1)受扰动频率影响，弱、强冲击倾向煤岩组合体易发生超低摩擦效应的频率显著影响区分别为2.0～3.0, 2.5～3.5 Hz,且随着冲击倾向性程度的增强，频率显著影响区逐渐右移。(2)相比于弱冲击倾向性煤岩组合体，强冲击倾向性煤岩组合体发生超低摩擦效应时水平位移、动能和摩擦力降幅较大，煤块易发生超低摩擦滑动。(3)随着煤岩组合体剩余能量指数的增大，冲击倾向性程度逐渐增强，动能呈指数规律增大，煤块越易发生超低摩擦滑动。研究结果可为超低摩擦型冲击地压的预测和防治提供参考。
Abstract：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 2.0-3.0 Hz 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 tendency 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.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2024.04.011
中图分类号:TD324
引用信息:
[1]李利萍,胡学锦,潘一山,等.煤岩组合体冲击倾向性对超低摩擦型冲击地压的影响机制[J].采矿与岩层控制工程学报,2024,6(04):23-33.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.011.
基金信息:
国家自然科学基金资助项目(51974148);; 辽宁省“兴辽英才计划”资助项目(XLYC1807130)