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Mechanical Properties and Fractal Characteristics of Fractured Coal Under Different Gas Pressures

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Abstract

Coal–rock dynamic disasters often occur under the coupling effect of gas and stress. However, in engineering practice, coal–rock has different types of damage, and so, it is necessary to further study the physical characteristics of coal–rock containing gas under damage conditions. This is even more valuable in guiding relevant practical engineering. Based on this, a self-developed experimental system for monitoring the temperature change of coal–rock containing gas rupture was used to carry out uniaxial compression infrared monitoring experiments on fractured coal under different gas pressures, and in this way, the effects of gas pressure on the mechanical properties and infrared response characteristics of fractured coal were investigated. MATLAB was used for image processing and combined with the principle of statistics to extract the cracks information, and parameters such as crack length–quantity fractal dimension, crack image fractal dimension, and the maximum infrared radiation temperature (MIRT) time-series correlation fractal value were introduced for the characterization, which revealed the influence of gas pressure on it. It was found that, with increase in gas pressure, the NT (the number of surface cracks) increased, and the LA (the average trace length of the cracks) decreased when the crevasse coal was destroyed. Both the DL (the crack length–quantity fractal dimension) and the D (the fractal dimension) of crack images increased with increase in gas pressure; the gas had an inhibitory effect on the sudden change of the temperature field on the surface of coal, but on the contrary, it enhanced its fluctuation, and with increase in gas pressure, the MIRT was transformed from surge to sudden drop when the specimen was damaged, and the DC (the correlation fractal value) was linearly decreasing. The results explain the deterioration mechanism of fractured coal under the gas, reveal the influence of gas pressure on its infrared response, and have certain positive significance for disaster monitoring of similarly damaged coal.

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Acknowledgments

This research was funded by The National Natural Science Foundation of China [Grant Number 51774117].

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Authors and Affiliations

  1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Fan Li, Tianxuan Hao, Guoqing Wang, Meiqi Yuan & Lizhen Zhao

  2. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo, 454000, China

    Tianxuan Hao

  3. College of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan, 467036, China

    Yiju Tang

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  1. Fan Li
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Correspondence to Fan Li.

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Li, F., Hao, T., Wang, G. et al. Mechanical Properties and Fractal Characteristics of Fractured Coal Under Different Gas Pressures. Nat Resour Res 33, 793–812 (2024). https://doi.org/10.1007/s11053-023-10305-1

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