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<p>To investigate the depressurization mechanism in a close coal seam group with double upper protective layers, two mining scenarios with different protective layers were analyzed using a finite element numerical model. The stress distribution rule of the protected main coal seam, the displacement of roof strata, and the evolution characteristics of the plastic zone were studied. Physical modeling experiments were also conducted to monitor the fracture behaviors of the overlying rock, the depressurization of the main coal seam, and the displacement and deformation of the overlying strata. The depressurization mechanism of the multiple-seam mining was revealed. The results showed that: The stress of the main coal seam after the mining of the single and double protective layers dropped to 11&#xa0;MPa and 10&#xa0;MPa, respectively. The pressure stress relief rates were 11% and 20% for the two scenarios. The depressurization effect of the upper protective layers induced an upward vertical displacement within the protected coal seam, and the displacement of the main coal seam caused by the double upper protective layers mining was greater. Hence, it was concluded that more pronounced depressurization effect was produced by the double upper protective layers mining in the close coal seam group.</p>

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Depressurization Mechanisms in Closely Spaced Coal Seam Group Mining

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Gaofeng Song,
  • Jingwei Gao,
  • Yang Zhang,
  • Guanghui Xu,
  • Minghui Zan,
  • Yuxin Wang,
  • Songli Jin,
  • Pengfei Zhang,
  • Dezhong Kong

摘要

To investigate the depressurization mechanism in a close coal seam group with double upper protective layers, two mining scenarios with different protective layers were analyzed using a finite element numerical model. The stress distribution rule of the protected main coal seam, the displacement of roof strata, and the evolution characteristics of the plastic zone were studied. Physical modeling experiments were also conducted to monitor the fracture behaviors of the overlying rock, the depressurization of the main coal seam, and the displacement and deformation of the overlying strata. The depressurization mechanism of the multiple-seam mining was revealed. The results showed that: The stress of the main coal seam after the mining of the single and double protective layers dropped to 11 MPa and 10 MPa, respectively. The pressure stress relief rates were 11% and 20% for the two scenarios. The depressurization effect of the upper protective layers induced an upward vertical displacement within the protected coal seam, and the displacement of the main coal seam caused by the double upper protective layers mining was greater. Hence, it was concluded that more pronounced depressurization effect was produced by the double upper protective layers mining in the close coal seam group.