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<p>To investigate the permeability of large-scale boundary faults and their effect on coal pillar design, a major large-scale boundary reverse fault labeled as F22 and the derived reverse fault labeled as FN1 were studied in the III3 mining area of the Zhuxianzhuang coal mine, which belongs to the Huaibei Mining Bureau. A comprehensive approach was adopted to ascertain the conductivity of the fault, including integrated on-site sampling, laboratory tests, underground discharge tests, numerical simulation, and analog analysis. Drill samples of the the fault zone and surrounding strata were analyzed by x-ray diffraction (XRD) and microscopic observations to ascertain mineral composition and microfracture characteristics, yielding a preliminary permeability analysis. Underground discharge tests confirmed that F22 is a non-water-conducting fault under undisturbed conditions. Subsequently, a numerical model incorporating the mining area's major large-scale boundary fault was established based on stratigraphic profiles from prospecting lines, analyzing mining-induced changes in the conductivity of the F22 and FN1 faults during excavation of the 10th coal seam. The results showed that the FN1 fault acts as a stress barrier during mining and becomes the primary water inrush channel post-excavation. Finally, in compliance with regulations, we determined the appropriate width of a barrier pillar for the FN1 fault aligning with simulation results. The changes in the conductivity of large-scale mine field boundary faults due to mining was investigated by fluid–structure interaction, and the appropriate width of the barrier pillar was determined to be 153&#xa0;m, which was basically consistent with the empirical formula calculation. The findings provide valuable references for similar studies and safe production in the Zhuxianzhuang coal mine and other mines with similar conditions.</p>

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A Study on the Conductivity of a Large-scale Boundary Fault and the Design of an Appropriately Sized Barrier Pillar

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Shuyun Zhu,
  • Han Fang,
  • Guanyu Zhu,
  • Yingzhou Chen

摘要

To investigate the permeability of large-scale boundary faults and their effect on coal pillar design, a major large-scale boundary reverse fault labeled as F22 and the derived reverse fault labeled as FN1 were studied in the III3 mining area of the Zhuxianzhuang coal mine, which belongs to the Huaibei Mining Bureau. A comprehensive approach was adopted to ascertain the conductivity of the fault, including integrated on-site sampling, laboratory tests, underground discharge tests, numerical simulation, and analog analysis. Drill samples of the the fault zone and surrounding strata were analyzed by x-ray diffraction (XRD) and microscopic observations to ascertain mineral composition and microfracture characteristics, yielding a preliminary permeability analysis. Underground discharge tests confirmed that F22 is a non-water-conducting fault under undisturbed conditions. Subsequently, a numerical model incorporating the mining area's major large-scale boundary fault was established based on stratigraphic profiles from prospecting lines, analyzing mining-induced changes in the conductivity of the F22 and FN1 faults during excavation of the 10th coal seam. The results showed that the FN1 fault acts as a stress barrier during mining and becomes the primary water inrush channel post-excavation. Finally, in compliance with regulations, we determined the appropriate width of a barrier pillar for the FN1 fault aligning with simulation results. The changes in the conductivity of large-scale mine field boundary faults due to mining was investigated by fluid–structure interaction, and the appropriate width of the barrier pillar was determined to be 153 m, which was basically consistent with the empirical formula calculation. The findings provide valuable references for similar studies and safe production in the Zhuxianzhuang coal mine and other mines with similar conditions.