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8 / 2023-05-08 14:52:36
Study of meso-mechanical properties of coal based on nanoindentation experiments
mineral components,nanoindentation,flaw,Mori-Tanaka method
3. Mine dynamic disaster
摘要录用
丹 赵 / 中国矿业大学（北京）
Baisheng Nie / China University of Mining undefined Technology(Beijing)
Fanbei Kong / China University of Mining and Technology (Beijing)
Mengxia Wang / 中国矿业大学（北京）
Coal mechanical properties are one of the important influencing factors of coal rock dynamic hazards, which are directly related to the production safety of mines. Four different coal samples were selected for nanoindentation experiments under different peak loading conditions to study the mechanical properties of coal rock at the fine scale. Combining with X-ray diffraction experiments and Keyence digital Microscope to analyze the influence of mineral components in coal on the mechanical properties of coal. The results show that the more non-homogeneous the coal sample is, the more dispersed the nanoindentation loading phase curve is. Loading-displacement curves can be observed as pop-in events with small load variation but increasing displacement variation, which is related to the presence of pores, layering in the mineral composition, and the formation of microscale and macroscale cracks. Different mineral content fillings lead to differences in the physical and mechanical properties of the coal body at the micro-nano scale, with clay minerals being looser and weakening the mechanical properties of the coal samples, while quartz and carbonate minerals strengthen the mechanical properties of the coal samples, and quartz inhibits crack extension. The microstructure and mechanical inhomogeneous characteristics of the coal body are also revealed, and the mechanism of crack expansion in the microstructure of coal samples is explored, which provides a theoretical basis for the prevention and control of dynamic disasters in coal mines.
重要日期

  • 会议日期

    08月18日

    2023

    至

    08月20日

    2023

  • 07月07日 2023

    初稿截稿日期

  • 08月20日 2023

    注册截止日期

主办单位
International Committee of Mine Safety Science and Engineering
承办单位
Heilongjiang University of Science and Technology
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