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<p>To study the failure modes and influence of related factors on the failure modes of pillars with weak interlayers, a hard − soft − hard structural mechanical model of pillars was established, in which a pillar with a weak interlayer in a limestone mine was used as the research object, and the expressions of the stress components of the weak interlayer were derived. On the basis of the mechanical characteristics of the weak interlayer, the failure modes of pillars with weak interlayers can be divided into tensile failure, shear failure, and comprehensive failure. Combined with the safety factor, the failure characteristics of the weak interlayer at different dip angles (<i>θ</i>) and thicknesses (<i>h</i>) were analyzed. The results revealed that the failure modes of pillars with weak interlayers are doubly influenced by the dip angle and the thickness of the weak interlayer. The compression safety factor (<i>F</i><sub><i>p</i></sub>) is positively correlated with <i>θ</i> and negatively correlated with <i>h</i>. The smaller <i>h</i> is, the greater the slope change of the <i>F</i><sub><i>p</i></sub> curve. The shear safety factor (<i>F</i><sub><i>t</i></sub>) is negatively correlated with the dip angle in the range of 0° &lt; <i>θ</i> ≤ 45° but positively correlated with the dip angle in the range of <i>θ</i> &gt; 45°. When <i>θ</i> is fixed, the change in <i>h</i> has little effect on <i>F</i><sub><i>t</i></sub>, and the maximum shear stress is at the top of the upper interface and the bottom of the lower interface. The numerical simulation results and engineering examples verify the rationality of the theoretical calculation results. The research results provide theoretical support for the safe mining of such mines.</p>

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Failure Modes and Influencing Factor Analysis of Limestone Pillars with Weak Interlayers

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Lichun Jiang,
  • Yinghao Li,
  • Yu Xiong

摘要

To study the failure modes and influence of related factors on the failure modes of pillars with weak interlayers, a hard − soft − hard structural mechanical model of pillars was established, in which a pillar with a weak interlayer in a limestone mine was used as the research object, and the expressions of the stress components of the weak interlayer were derived. On the basis of the mechanical characteristics of the weak interlayer, the failure modes of pillars with weak interlayers can be divided into tensile failure, shear failure, and comprehensive failure. Combined with the safety factor, the failure characteristics of the weak interlayer at different dip angles (θ) and thicknesses (h) were analyzed. The results revealed that the failure modes of pillars with weak interlayers are doubly influenced by the dip angle and the thickness of the weak interlayer. The compression safety factor (Fp) is positively correlated with θ and negatively correlated with h. The smaller h is, the greater the slope change of the Fp curve. The shear safety factor (Ft) is negatively correlated with the dip angle in the range of 0° < θ ≤ 45° but positively correlated with the dip angle in the range of θ > 45°. When θ is fixed, the change in h has little effect on Ft, and the maximum shear stress is at the top of the upper interface and the bottom of the lower interface. The numerical simulation results and engineering examples verify the rationality of the theoretical calculation results. The research results provide theoretical support for the safe mining of such mines.