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Study on the evolution law of the gas flow field based on the distribution characteristics of voids in the overlying strata in a goaf

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Abstract

To study the distribution law and flow field of gas concentration in goafs, using the goaf of the 714 working face in the Qinan Coal Mine as the engineering background, the gas concentration and flow field under different wind speeds were simulated based on the optimized porosity distribution model of gob caving rock using FLUENT software. The results show that, due to the influence of air leakage, the gas concentration in the shallow part of the goaf is greatly affected by the wind speed of the air intake air roadways, while the deep part of the goaf is nearly unaffected by the wind speed. When the wind speed of the intake air roadways is 1 m/s, there are three gas accumulation areas within the goaf, and, when the wind speed is between 2 and 3 m/s, there are only two gas accumulation areas. The distribution law of the gas concentration in the simulation results, based on the location of the gas accumulation areas and the rock properties of the “vertical three zones” in the goaf, informed the design of high-level drilling construction technology for the 714 working face of Qinan Coal Mine, and promising results are achieved.

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Data availability

Some or all data, models, or code generated or used during the study are available from the corresponding author by request.

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Acknowledgments

The authors would like to acknowledge the support of the National Natural Science Foundation of China (52074173, 51604168, and 51934004), Key Research and Development Plan of Shandong Province, China (2019GSF111033), Major Program of Shandong Province Natural Science Foundation (ZR2018ZA0602), Taishan Scholars Project Special Funding (TS20190935), and Development plan of Excellent Youth Innovation Team in Colleges and universities of Shandong Province (2019KJH006).

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Authors and Affiliations

  1. College of Mining and Safety Engineering, Shandong University of Science and Technology, 579 Qianwangang Rd, Huangdao District, Qingdao, 266590, China

    Hao Li, Zhen Liu, Danliang Zhu, He Yang & Wendi Wang

  2. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China

    Hao Li, Zhen Liu, Danliang Zhu, He Yang & Wendi Wang

  3. School of Safety Engineering, China University of Mining and Technology, 1 Daxue Rd, Quanshan District, Xuzhou, 221000, China

    Yongliang Yang

Authors
  1. Hao Li
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  2. Zhen Liu
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  3. Yongliang Yang
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  4. Danliang Zhu
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  5. He Yang
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  6. Wendi Wang
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Correspondence to Zhen Liu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influencethe work reported in this paper.

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The authors declare that they have no competing interests.

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Responsible Editor: Murat Karakus

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Li, H., Liu, Z., Yang, Y. et al. Study on the evolution law of the gas flow field based on the distribution characteristics of voids in the overlying strata in a goaf. Arab J Geosci 14, 1056 (2021). https://doi.org/10.1007/s12517-021-07398-4

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  • DOI: https://doi.org/10.1007/s12517-021-07398-4

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