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<p>This study investigates floor stress evolution and support strategy for lower roadway in close-distance coal seam environments, using a coal mine in Shanxi Province as a case study. By integrating theoretical analysis, numerical simulation, and field measurements, a stress-calculation model for residual coal pillars is developed and the stress environment of roadway is systematically analyzed. Drawing on the theory of “butterfly-shaped” plastic zone, the observed asymmetric roadway deformation is correlated with mining-induced stress distribution. The results show that abutment pressure from the residual pillar in the upper seam, together with stress relief from the goaf, jointly induce rotation and variation of the maximum principal stress in the floor: at 10 m from the pillar boundary, the angle between the maximum principal stress vector and the horizontal direction is 19°, with a principal stress ratio of 2.38. Such stress rotation and increased stress ratio are primary drivers of asymmetric deformation. Accordingly, a butterfly-failure-based support method is proposed, in which the plastic extension zone is reinforced by anchor cables embedded in intact rock, ensuring a stable foundation and improved roadway stability. These findings offer both theoretical insights and practical guidance for optimizing roadway support under similar geological conditions.</p>

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Floor stress distribution law and stability control of the surrounding rock in the lower mining roadway of close-distance coal seams

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Jia-jun Liu,
  • Wang Liu

摘要

This study investigates floor stress evolution and support strategy for lower roadway in close-distance coal seam environments, using a coal mine in Shanxi Province as a case study. By integrating theoretical analysis, numerical simulation, and field measurements, a stress-calculation model for residual coal pillars is developed and the stress environment of roadway is systematically analyzed. Drawing on the theory of “butterfly-shaped” plastic zone, the observed asymmetric roadway deformation is correlated with mining-induced stress distribution. The results show that abutment pressure from the residual pillar in the upper seam, together with stress relief from the goaf, jointly induce rotation and variation of the maximum principal stress in the floor: at 10 m from the pillar boundary, the angle between the maximum principal stress vector and the horizontal direction is 19°, with a principal stress ratio of 2.38. Such stress rotation and increased stress ratio are primary drivers of asymmetric deformation. Accordingly, a butterfly-failure-based support method is proposed, in which the plastic extension zone is reinforced by anchor cables embedded in intact rock, ensuring a stable foundation and improved roadway stability. These findings offer both theoretical insights and practical guidance for optimizing roadway support under similar geological conditions.