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Research on the Development Law of Pre-Mining Microseisms and Risk Assessment of Floor Water Inrush: A Case Study of the Wutongzhuang Coal Mine in China

Author

Listed:
  • Lei Huang

    (School of Energy and Mining, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Yanchun Xu

    (School of Energy and Mining, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Shiqi Liu

    (School of Energy and Mining, China University of Mining and Technology (Beijing), Beijing 100083, China
    Jizhong Energy Group Co., Ltd., Xingtai 054000, China)

  • Qiukai Gai

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Wei Miao

    (School of Energy and Mining, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Yubao Li

    (Hebei Coal Research Institute Co., Ltd., Xingtai 054000, China)

  • Lisong Zhao

    (Hebei Coal Research Institute Co., Ltd., Xingtai 054000, China)

Abstract

Coal-mining areas are widely distributed in Northern China, but are under threat from confined water in the mining operation, resulting in a series of floor water- inrush hazards. Therefore, it is significant to effectively evaluate the floor water inrush to ensure safe and efficient coal mining. The 182602 working face of the Wutongzhuang coal mine served as the background for our research. The concept of “pre-mining microseisms” was proposed, and based on this, microseismic monitoring equipment was arranged on site. The correlation between microseismic events and the water abundance of an aquifer was analyzed, and a floor water inrush evaluation method was constructed based on the three elements of an aquifer and pre-mining microseisms. The main results are as follows: first, the microseismic events were excited by artificial disturbances before the mining of the working face including slurry diffusion and neighboring mining, which had the characteristics of sporadicity, clustering, and periodicity. Second, the regional distribution of water abundance was determined by taking the water inflow, water pressure, and grouting volume as the outward performance characteristics of water abundance in the Shanvuqing aquifer. Furthermore, the correlation coefficient between the pre-mining microseisms and the three elements of the aquifer (water inflow, water pressure, and grouting volume) was larger than 0.7. On this basis, an evaluation method associated with the water inrush risk along the strike of the working face was established based on pre-mining microseisms, dividing the working face into dangerous zones, suspected dangerous zones, and safe zones. Furthermore, pre-mining microseisms, water abundance, and structures were introduced as risk-evaluation indices, and the complete weight was calculated using an analytic hierarchy process and entropy-weight technique, before a vulnerability index model of floor water inrush was built. Finally, targeted treatment procedures were efficiently implemented to ensure the safe mining of working face 182602 due to the successful prediction of potential water risk zones. The research results provide scientific and technological support for pre-mining microseisms combined with water abundance as a technical method to prevent floor water inrush.

Suggested Citation

  • Lei Huang & Yanchun Xu & Shiqi Liu & Qiukai Gai & Wei Miao & Yubao Li & Lisong Zhao, 2022. "Research on the Development Law of Pre-Mining Microseisms and Risk Assessment of Floor Water Inrush: A Case Study of the Wutongzhuang Coal Mine in China," Sustainability, MDPI, vol. 14(15), pages 1-22, August.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:15:p:9774-:d:883082
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