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Effect of Water on Mechanical Properties of Coal, Charge Induction, and Rockburst Hazard Prevention

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Abstract

Rockburst is a sudden disastrous instability of coal mass that poses a serious threat to underground exploitation of coal resources; therefore, approaches of prediction and control methods are valuable for improving mining environments. The mechanical properties and bursting liability of coal with drying, under-saturated, and saturated moisture content under uniaxial compression are investigated, and the charge induction signal during coal deformation both in the laboratory and on-site is recorded in this study. The presence of water reduces the cohesion and increases the internal stress caused by non-uniform deformation of minerals, resulting in the strength, elastic modulus, and bursting liability being weakened. The charge induction precursor main frequency band is 1–100 Hz and belongs to the very-low-frequency signal regime, and it indeed varies with the loading stage, leading to specimen failure owing to changes in amplitude and continuity of the charge pulse in both the time and frequency domains. Water inhibits the richness of charge induction and reduces the bursting liability, and the earlier the precursor appears, the more total charge emerges. Moreover, measurement results indicate that the amplitude and continuity of the charge pulse decrease over a longer time, as recorded in a coal seam with water injection, further verifying the weakening of the coal dynamic characteristics. Charge induction can be a valuable tool with which to obtain the precursors for rockburst and to aid the evaluation of water injection.

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Acknowledgements

This work was supported by The National Key Research and Development Program of China (No. 2022YFC3004605), The National Natural Science Foundation of China (No. 52204218, 52274203,51974186, 51974147), The Liaoning Province Doctor Startup Fund(2021-BS-271), and The Discipline Innovation Team of Liaoning Technical University (LNTU20TD-17).

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Authors and Affiliations

  1. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China

    Xin Ding, Xiaochun Xiao & Di Wu

  2. Liaoning Key Laboratory of Mining Environment and Disaster Mechanics, Liaoning Technical University, Fuxin, 123000, China

    Xin Ding, Xiaochun Xiao, Di Wu & Yishan Pan

  3. School of Civil and Resource Engineering, University of Science & Technology, Beijing, Beijing, 100083, China

    Xiangfeng Lv

  4. Environmental Engineering College, Liaoning University, Shenyang, 110136, China

    Yishan Pan

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Ding, X., Xiao, X., Lv, X. et al. Effect of Water on Mechanical Properties of Coal, Charge Induction, and Rockburst Hazard Prevention. Mining, Metallurgy & Exploration 40, 277–290 (2023). https://doi.org/10.1007/s42461-022-00718-6

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