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<p>Affected by the disturbance of high-intensity repeated mining, the changes of stress field and fracture field of overburden rock in the extra-thick coal seam are easy to cause mine dynamic disasters. In order to prevent the occurrence of a series of mine disasters and put forward corresponding countermeasures, the evolution law, superposition effect, and coupling mechanism of stress field and fracture field are analyzed. The results show that the rotation amplitude of the block increases during the lower coal layer mining stage, and the short cantilever beam structure exhibits periodic fracture instability, which cannot form a masonry beam structure. A new characteristic of rock layer activity can be observed in the lower coal layer mining stage with a high development degree and a wide range of open cracks. Moreover, the relationships of fracture fractal dimension of roof fissure in the upper and lower coal mining stages with the advancing distance are ExpAssoc and polynomial distributions with an average value of 2.52 and 2.59, respectively. Overall, the average values of the key indexes of the stress filed and fracture field in the lower coal layer mining stage are larger than that of the upper coal layer mining stage.</p>

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Interaction mechanism of stress field and failure analysis on overlying strata under LTCC layered mining

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Huayong Lv,
  • Fei Liu,
  • Xiting Long,
  • Changtai Zhou,
  • Jian Ou

摘要

Affected by the disturbance of high-intensity repeated mining, the changes of stress field and fracture field of overburden rock in the extra-thick coal seam are easy to cause mine dynamic disasters. In order to prevent the occurrence of a series of mine disasters and put forward corresponding countermeasures, the evolution law, superposition effect, and coupling mechanism of stress field and fracture field are analyzed. The results show that the rotation amplitude of the block increases during the lower coal layer mining stage, and the short cantilever beam structure exhibits periodic fracture instability, which cannot form a masonry beam structure. A new characteristic of rock layer activity can be observed in the lower coal layer mining stage with a high development degree and a wide range of open cracks. Moreover, the relationships of fracture fractal dimension of roof fissure in the upper and lower coal mining stages with the advancing distance are ExpAssoc and polynomial distributions with an average value of 2.52 and 2.59, respectively. Overall, the average values of the key indexes of the stress filed and fracture field in the lower coal layer mining stage are larger than that of the upper coal layer mining stage.