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Time-Varying Multifractal Characteristics and Formation Mechanism of Loaded Coal Electromagnetic Radiation

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Abstract

Dynamic collapses of deeply mined coal rocks are severe threats to miners. To predict the collapses more accurately using electromagnetic radiation (EMR), we investigate the time-varying multifractal characteristics and formation mechanism of EMR induced by underground coal mining. A series of uniaxial compression and multi-stage loading experiments with coal samples of different mechanical properties were carried out. The EMR signals during their damage evolution were monitored in real-time; the inherent law of EMR time series was analyzed by fractal theory. The results show that the time-varying multifractal characteristics of EMR are determined by damage evolutions process, the dissipated energy caused by damage evolutions such as crack propagation, fractal sliding and shearing can be regard as the fingerprint of various EMR micro-mechanics. Based on the Irreversible thermodynamics and damage mechanics, we introduced the damage internal variable, constructed the dissipative potential function and established the coupled model of the EMR and the dissipative energy, which revealed the nature of dynamic nonlinear characteristics of EMR. Dynamic multifractal spectrum is the objective response of EMR signals, thus it can be used to evaluate the coal deformation and fracture process.

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Acknowledgments

This work is supported by The 12th Five Year National Science, Technology Support Key Project of China (2012BAK04B07-2,2012BAK09B01-04), National Natural Science Foundation of China (51104156) and High Lever Paper Special Found Supported by CUMT (2012LWBZ04). The authors are grateful to all the coal mines mentioned in the paper for providing experimental environments.

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Authors and Affiliations

  1. School of Safety Engineering, China University of Mining and Technology, Xuzhou Daxue Load, Xuzhou, Jiangshu, China

    Shaobin Hu, Enyuan Wang, Zhonghui Li, Rongxi Shen & Jie Liu

  2. Key Laboratory of Gas and Fire Control for Coal Mines, Xuzhou, China

    Enyuan Wang

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  1. Shaobin Hu
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  2. Enyuan Wang
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  3. Zhonghui Li
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Correspondence to Enyuan Wang.

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Hu, S., Wang, E., Li, Z. et al. Time-Varying Multifractal Characteristics and Formation Mechanism of Loaded Coal Electromagnetic Radiation. Rock Mech Rock Eng 47, 1821–1838 (2014). https://doi.org/10.1007/s00603-013-0501-9

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  • DOI: https://doi.org/10.1007/s00603-013-0501-9

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