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Protection scope and gas extraction of the low-protective layer in a thin coal seam: lessons from the DaHe coalfield, China

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Abstract

Aiming at promoting thin coal seam pressure relief gas extraction, as well as delimiting the protection range of the low-protective layer in thin coal seam, in this paper, we simulated the changing process of the protective layer stress field and deformation field during the low-protective layer mining and obtained the characteristics of the displacement as well as the stress varied characteristics of the overlying strata in the low-protective layer mining. According to the protection layer mining stress relief and the deformation protection criterion, the tendency and trend of the protection layer protection scope were determined, and the theoretical calculation results were basically consistent with the direction protection angle of the protected coal seam. Taking the Dahe (DH) coalmine as an example, the floor rock roadway as the gas drainage roadway to extraction gas as well as the scheme of gas extraction and pressure relief in the upper and lower layers of the protective layer were implemented. The effect of gas control scheme showed that the working gas concentration reached the mining requirement. We finally established the low-protective layer in thin coal mining integrated technical scheme of protection scope and pressure relief gas extraction.

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Authors and Affiliations

  1. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China

    Zuoyong Cao, Enyuan Wang & Biao Kong

  2. School of Safety Engineering, China University of Mining & Technology, Xuzhou, 221116, China

    Zuoyong Cao, Xueqiu He, Enyuan Wang & Biao Kong

  3. Guizhou Administrator of Coal Mine Safety, Guiyang, Guizhou, 550004, China

    Zuoyong Cao

  4. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xueqiu He

Authors
  1. Zuoyong Cao
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  2. Xueqiu He
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  3. Enyuan Wang
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  4. Biao Kong
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Correspondence to Enyuan Wang.

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Cao, Z., He, X., Wang, E. et al. Protection scope and gas extraction of the low-protective layer in a thin coal seam: lessons from the DaHe coalfield, China. Geosci J 22, 487–499 (2018). https://doi.org/10.1007/s12303-017-0061-1

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  • DOI: https://doi.org/10.1007/s12303-017-0061-1

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