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<p>The co-mining of coal and stacked paragenetic minerals faces challenges due to mutual interference in strata movement and fluid migration. It is extremely important to study the superimposed effects on strata movement during co-mining of stacked paragenetic minerals for the coordinated development of coal-measure minerals. This study takes the coal seam and sedimentary bauxite as an example. Through physical modelling, numerical simulation, and theoretical analysis, it systematically investigates the superimposed effects of mining-induced stress, deformation, and fractures in the coal-bauxite interburden under the combined longwall coal mining and room and pillar bauxite mining methods. The results show that coal-bauxite co-mining induces stress axis rotation in bauxite pillars located beneath the uncompacted zone of the coal goaf, transforming their stress state from uniaxial compression to a combined compression-shear state, thereby increasing the risk of pillar shear-slip and instability. The subsidence deformation caused by bauxite stope instability dominates the superimposed deformation of the interburden, highlighting that bauxite stope stability is key to ensuring the stability of the coal-bauxite interburden. The fractal dimension and fracture area ratio serve as effective feature parameters for quantitatively characterizing the evolution of mining-induced fractures in the interburden at different mining stages. Both the total fracture area ratio and fractal dimension exhibit significant staged and nonlinear characteristics during both upward and downward mining sequences. The upper stretch-draw fractures developed above the two boundaries of the bauxite stope constitute the main seepage channels within the interburden. Based on these findings, a conceptual model of the superimposed effects on strata activity was established, centered on the relationship between the coal seam floor failure depth, the bauxite overburden failure height, and the interburden thickness. The key stability criterion for the interburden is whether the competent barrier strata can maintain their integrity and low permeability under the superimposed effects of co-mining disturbances and water pressure from the coal goaf. This research provides a theoretical basis for feasibility assessment and disaster prevention and control in coal-bauxite co-mining.</p>

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Superimposed effects on strata movement during co-mining of stacked coal seam and bauxite in coal-measures

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月29日

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  • Zhanwei Wu,
  • Bingxiang Huang,
  • Xinglong Zhao,
  • Xiaoke Han,
  • Mingke Wang,
  • Binghong Li,
  • Qingqiu Zhang,
  • Zhipeng Wei

摘要

The co-mining of coal and stacked paragenetic minerals faces challenges due to mutual interference in strata movement and fluid migration. It is extremely important to study the superimposed effects on strata movement during co-mining of stacked paragenetic minerals for the coordinated development of coal-measure minerals. This study takes the coal seam and sedimentary bauxite as an example. Through physical modelling, numerical simulation, and theoretical analysis, it systematically investigates the superimposed effects of mining-induced stress, deformation, and fractures in the coal-bauxite interburden under the combined longwall coal mining and room and pillar bauxite mining methods. The results show that coal-bauxite co-mining induces stress axis rotation in bauxite pillars located beneath the uncompacted zone of the coal goaf, transforming their stress state from uniaxial compression to a combined compression-shear state, thereby increasing the risk of pillar shear-slip and instability. The subsidence deformation caused by bauxite stope instability dominates the superimposed deformation of the interburden, highlighting that bauxite stope stability is key to ensuring the stability of the coal-bauxite interburden. The fractal dimension and fracture area ratio serve as effective feature parameters for quantitatively characterizing the evolution of mining-induced fractures in the interburden at different mining stages. Both the total fracture area ratio and fractal dimension exhibit significant staged and nonlinear characteristics during both upward and downward mining sequences. The upper stretch-draw fractures developed above the two boundaries of the bauxite stope constitute the main seepage channels within the interburden. Based on these findings, a conceptual model of the superimposed effects on strata activity was established, centered on the relationship between the coal seam floor failure depth, the bauxite overburden failure height, and the interburden thickness. The key stability criterion for the interburden is whether the competent barrier strata can maintain their integrity and low permeability under the superimposed effects of co-mining disturbances and water pressure from the coal goaf. This research provides a theoretical basis for feasibility assessment and disaster prevention and control in coal-bauxite co-mining.