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<p>In underground coal mines, the primary cause of the large-area roof collapse disasters is the invisible concentrated stress areas within the overburden rock strata. In order to gain a profound understanding of the mining-induced stress distribution within the overburden rock strata and to visualize the evolutionary process of stress concentration, taking the Yima mining area, Henan Province, China, as the engineering background. A visualization calculation method is employed in the laboratory to delineate the process of gradual concentration and dissipation of overburden mining-induced stress during the coal seam mining. The research results show that, with the advancement of coal seam mining, the stress concentration in the overburden rock strata is not presented as a single point or a single region, but as an annular stress concentration area that continuously appears and disappears. Since the stress within this area is approximately constant and the area has a shape similar to that of an annular shell, it is defined as a constant stress concentration shell, abbreviated as CSCS in this study. According to the monitoring results, the CSCS will dynamically transform and gradually close into a shell with the advancement of the mining face, and then suddenly disappear with the roof caving. In addition, the FLAC<sup>3D</sup> code is employed to numerically simulate the dynamic evolution of the CSCS in overburden rock strata. The results indicate that the CSCS is closely associated with variables such as the length of coal seam mining, width of the mining face, mechanical properties of the overburden rock strata, dip angle of the coal seam, coal mining velocity, buried depth of the coal seam, and the rock masses quality. A substantial increase in the area of the CSCS is a precursor to a large-area roof collapse. Preventing the formation of CSCS from extending into the higher position of overburden rock strata at the top of the mining face is crucial for maintaining the stability of the overburden rock strata and avoiding roof accidents.</p>

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Study on the Formation and Evolution of Constant Stress Concentration Shell in Overburden Rock Strata During Coal Seam Mining

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Hongwei Wang,
  • Lili Xie,
  • Yinkai Li,
  • Yiwei Hao,
  • Xinyuan Qi

摘要

In underground coal mines, the primary cause of the large-area roof collapse disasters is the invisible concentrated stress areas within the overburden rock strata. In order to gain a profound understanding of the mining-induced stress distribution within the overburden rock strata and to visualize the evolutionary process of stress concentration, taking the Yima mining area, Henan Province, China, as the engineering background. A visualization calculation method is employed in the laboratory to delineate the process of gradual concentration and dissipation of overburden mining-induced stress during the coal seam mining. The research results show that, with the advancement of coal seam mining, the stress concentration in the overburden rock strata is not presented as a single point or a single region, but as an annular stress concentration area that continuously appears and disappears. Since the stress within this area is approximately constant and the area has a shape similar to that of an annular shell, it is defined as a constant stress concentration shell, abbreviated as CSCS in this study. According to the monitoring results, the CSCS will dynamically transform and gradually close into a shell with the advancement of the mining face, and then suddenly disappear with the roof caving. In addition, the FLAC3D code is employed to numerically simulate the dynamic evolution of the CSCS in overburden rock strata. The results indicate that the CSCS is closely associated with variables such as the length of coal seam mining, width of the mining face, mechanical properties of the overburden rock strata, dip angle of the coal seam, coal mining velocity, buried depth of the coal seam, and the rock masses quality. A substantial increase in the area of the CSCS is a precursor to a large-area roof collapse. Preventing the formation of CSCS from extending into the higher position of overburden rock strata at the top of the mining face is crucial for maintaining the stability of the overburden rock strata and avoiding roof accidents.