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Experimental study on coal and gas outburst and the variation characteristics of gas pressure

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Abstract

With a self-designed physical simulation test system for coal and gas outburst and instantaneous gas desorption of coal, orthogonal tests were designed and conducted to investigate the influences of initial gas pressure, coal particle size and outburst mouth diameter on coal and gas outburst firstly, then gas pressure variation tests were conducted under different initial gas pressures and coal quantities to investigate the variation characteristics of gas pressure. The results show that the influence of outburst mouth diameter on the intensity and duration time of coal and gas outburst was biggest followed by coal particle size and initial gas pressure. The total outburst time was shorter when outburst mouth diameter was bigger, meanwhile the outburst intensity and outburst distance were larger when initial gas pressure was higher, coal particle size was smaller or outburst mouth diameter was larger. In some gas pressure variation tests, the maximum instantaneous gas pressure exceeded the initial gas pressure when the latter was larger, which means the initial gas pressure play a crucial role in coal and gas outburst initiation. Finally, the critical initial gas pressure and gas content were calculated as a reference to predict coal and gas outburst danger.

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Acknowledgements

The research described in this paper was financially supported by the China National Natural Science Foundation (Grant No. 51109076) and the key scientific and technological project of Henan Province (Grant No. 152102210316).

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Authors and Affiliations

  1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Baohua Guo, Yizhe Li, Feng Jiao & Tao Luo

  2. The Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo, 454000, China

    Baohua Guo

  3. Key Laboratory of Safety and High-Efficiency Coal Mining, Ministry of Education (Anhui University of Science and Technology), Huainan, 232001, China

    Baohua Guo

  4. Zhangshuanglou Coalmine, Xuzhou Coal Industrial Group Co. Ltd, Xuzhou, 221616, China

    Qing Ma

Authors
  1. Baohua Guo
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  2. Yizhe Li
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  3. Feng Jiao
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  4. Tao Luo
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  5. Qing Ma
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Correspondence to Baohua Guo.

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Guo, B., Li, Y., Jiao, F. et al. Experimental study on coal and gas outburst and the variation characteristics of gas pressure. Geomech. Geophys. Geo-energ. Geo-resour. 4, 355–368 (2018). https://doi.org/10.1007/s40948-018-0092-8

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  • DOI: https://doi.org/10.1007/s40948-018-0092-8

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