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<p>Taking the Ping’an phosphate mine in Guizhou, China, as the research object, this study comprehensively used a similar simulation test and the Universal Distinct Element Code numerical simulation method to systematically study the mechanism of faults on the development height of overlying rock fissures (ORFs) in the overburden of phosphate ore bodies. The results show that (1) the existence of faults significantly increases the vertical displacement of overlying rock layers and pillars in the mining area, increasing the ORF height. (2) The inclination angle of the fault significantly affects the ORF height: when the dip angle is less than 45°, the ORF height of the mine room below the fault is higher than that of the one above it. When the dip angle is more than 45°, the rate of change of the ORF height of the ore body above it is accelerated. When the dip angle increases to 65°, the fissure of the mine room above the fault is a fissure zone, which is a “trapezium” fissure zone with a height of 81&#xa0;m. The height of a “positive-trapezoidal” fissure zone is 81&#xa0;m. (3) The increase in the fault drop will cause the ORF height to be “stepped.” The degree of fissure development is most significant in the mine room of ore body 1, below the fault. This study reveals the quantitative relationship between fault parameters (dip and drop) and ORF height, which offers a theoretical foundation for the forecasting, prevention, and control of fissure zones for the safe mining of fault-bearing phosphate mines.</p>

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Influence of Fault Geometry on the Development Height of Overlying Rock Fissures in Phosphate Ore Bodies

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Lin Zhou,
  • Chengyu Jiang,
  • Chen Wang,
  • Xunpeng Xia,
  • Zhengwei Liang,
  • Zaiyun Long

摘要

Taking the Ping’an phosphate mine in Guizhou, China, as the research object, this study comprehensively used a similar simulation test and the Universal Distinct Element Code numerical simulation method to systematically study the mechanism of faults on the development height of overlying rock fissures (ORFs) in the overburden of phosphate ore bodies. The results show that (1) the existence of faults significantly increases the vertical displacement of overlying rock layers and pillars in the mining area, increasing the ORF height. (2) The inclination angle of the fault significantly affects the ORF height: when the dip angle is less than 45°, the ORF height of the mine room below the fault is higher than that of the one above it. When the dip angle is more than 45°, the rate of change of the ORF height of the ore body above it is accelerated. When the dip angle increases to 65°, the fissure of the mine room above the fault is a fissure zone, which is a “trapezium” fissure zone with a height of 81 m. The height of a “positive-trapezoidal” fissure zone is 81 m. (3) The increase in the fault drop will cause the ORF height to be “stepped.” The degree of fissure development is most significant in the mine room of ore body 1, below the fault. This study reveals the quantitative relationship between fault parameters (dip and drop) and ORF height, which offers a theoretical foundation for the forecasting, prevention, and control of fissure zones for the safe mining of fault-bearing phosphate mines.