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<p>Compared with single coal seam mining, the vertical stress distribution law on the interlayer rock of the pillar goaf is more complicated, and the oversimplification of the stress calculation model leads to the misjudgment of engineering problems. In this paper, a verification method combining theoretical calculation, numerical simulation and on-site verification is used. To improve the accuracy of the prediction of the main roof collapse step and advance support pressure of the working face under the pillar goaf, the whole vertical stress model of the interlayer rock under the pillar goaf is established. By disassembling the vertical stress into several stresses, solving them separately, superposing them and adding the correction coefficient, the distribution formula of vertical stress of the interlayer rock under the pillar goaf is obtained. Using gradient descent algorithm and least square method, a computer optimization software for model correction coefficient is developed. The effect of the correction coefficient on the vertical stress distribution formula of the interlayer rock under the pillar goaf is revealed. A method for calculating the first collapse step of the main roof under nonlinear continuous load is presented. The accuracy of this method is proved to be 17.8% higher than that of the traditional method. The distribution law of the advance support pressure of the working face under the pillar goaf is studied, and the advance support range is distance to be 68&#xa0;m in the example. The stress increases multiple changes in a wavy manner, and the area 15&#xa0;m in front of the working face and directly below the center of the coal pillar change significantly.</p>

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Research and Application of the Calculation Method for Vertical Stress of Interlayer Rock in Coal Mining Under Pillar Goaf

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Qian Wang,
  • Yujiang Zhang,
  • Guorui Feng,
  • Defu Zhu,
  • Fudong Ma,
  • Wushuai Hao,
  • Shule Li,
  • Shuai Zhang

摘要

Compared with single coal seam mining, the vertical stress distribution law on the interlayer rock of the pillar goaf is more complicated, and the oversimplification of the stress calculation model leads to the misjudgment of engineering problems. In this paper, a verification method combining theoretical calculation, numerical simulation and on-site verification is used. To improve the accuracy of the prediction of the main roof collapse step and advance support pressure of the working face under the pillar goaf, the whole vertical stress model of the interlayer rock under the pillar goaf is established. By disassembling the vertical stress into several stresses, solving them separately, superposing them and adding the correction coefficient, the distribution formula of vertical stress of the interlayer rock under the pillar goaf is obtained. Using gradient descent algorithm and least square method, a computer optimization software for model correction coefficient is developed. The effect of the correction coefficient on the vertical stress distribution formula of the interlayer rock under the pillar goaf is revealed. A method for calculating the first collapse step of the main roof under nonlinear continuous load is presented. The accuracy of this method is proved to be 17.8% higher than that of the traditional method. The distribution law of the advance support pressure of the working face under the pillar goaf is studied, and the advance support range is distance to be 68 m in the example. The stress increases multiple changes in a wavy manner, and the area 15 m in front of the working face and directly below the center of the coal pillar change significantly.