Abstract
The instability and failure of water-bearing coal mass can lead to serious coal–rock dynamic disasters, such as mine water inrush. It brings severe challenges to the safety produce during coal mining activities. Facing to this, the fine monitoring and accurate prediction are the direct and effective solution. To explore the influence of water content on the infrared radiation (IR) and acoustic emission (AE) signals during coal destruction, uniaxial compression experiments of dry and water-saturated coal samples were carried out. The time–frequency response of AE and the change of three quantitative IR indexes after the head–tail difference and the first order difference processing are investigated, to further analyze the precursory information of the IR and AE response characteristics. The results show that the influence of water on damage and failure modes play significant role to promote the thermal energy value generated by thermoelastic effect and frictional thermal effect, which also changing the AE time–frequency characteristics. Water role promotes the increase of the average infrared radiation temperature (AIRT) in elastic stage and plastic stage, and weakens the AE activities obviously. The first order difference infrared variance (VIRTb), first order difference infrared skewness (SKIRTb) and first order difference infrared kurtosis (KUIRTb) show significant abrupt changes simultaneously with the damage variable during different water-bearing coal rupture damage. For the sensitivity of abnormal precursor, SKIRTb have good effect similar to VIRTb, while it is weaker for KUIRTb, and water can promote their sensitivity. The surface damage measured by IR is local characterization of the overall damage localized by AE. The combination of SKIRTb and b value for accurate early warning can play an excellent effect. The results can reveal the monitoring and forecast information for coal–rock dynamic disaster prevention under water involvement.
Highlights
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The IRT and AE characteristics and differences of dry and water-statured coal samples are studied.
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The variance, skewness and kurtosis of infrared radiation temperature field can characterize coal damage state, compared with damage variable.
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The precursory characteristics of first order difference infrared radiation skewness and b value of dry and water-saturated coal samples are analyzed.
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Acknowledgements
This research was supported by the following: (1) the National Natural Science Foundation of China (52074280, 52104234). (2) the Major scientific and technological innovation projects in Shandong Province (2019JZZY020505). (3) A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). (4) the Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX22_2665). (5) the Graduate Innovation Program of China University of Mining and Technology (2022WLJCRCZL176).
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TS: methodology, visualization, formal analysis, and writing—original draft. ZL: conceptualization, supervision and funding acquisition. XZ and YN: data curation and writing—review and editing. HT, QZ and ZZ: validation and data curation. ZG, CC and CL: software and validation.
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Shan, T., Li, Z., Zhang, X. et al. Infrared Radiation and Acoustic Emission of Damage Evolution and Failure Precursory for Water-Bearing Coal. Rock Mech Rock Eng 55, 7657–7674 (2022). https://doi.org/10.1007/s00603-022-03042-z
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DOI: https://doi.org/10.1007/s00603-022-03042-z