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<p>To improve coal recovery and mitigate high-stress hazards in deep mining, the roof cutting and pressure relief mining (abbreviated as “RCPR”) without coal pillars has been widely implemented in Chinese coal mines. This study combines physical similarity experiments with numerical simulation to examine, before and after extraction, how roof cutting alters pressure-relief behavior and stress migration at key locations of the panel, and to formulate a mathematical model of roof-cutting-induced stress migration. Results show that roof cutting reshapes the caving structure of the overburden and improves the stress environment in critical zones. Two dominant migration paths are identified: (i) horizontal transfer from the roadway roof toward the deep coal-pillar zone and the goaf edge, and (ii) vertical transfer from lower to higher roof levels. Consequently, the surrounding rock near the roadway experiences a “dilution-weakening” effect at low levels, while middle–upper levels exhibit a “migration-storage” response. Roof cutting also narrows the stress-recovery zone at the goaf margin, enhances load-bearing of the compacted caving zone, and drives stress toward the pillar interior and goaf edge. Enforcing stress conservation, a dual-side stress-migration model (pillar side and goaf side) is established, introducing a stress-migration ratio to quantify the directionality and intensity of stress transfer. These findings refine the theoretical framework of “RCPR” mining.</p>

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Study on the stress migration law and theoretical model of the stope roof under roof-cutting conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月11日

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  • Shuailong Feng,
  • Xiangjun Chen,
  • Lin Wang,
  • Yibo Li

摘要

To improve coal recovery and mitigate high-stress hazards in deep mining, the roof cutting and pressure relief mining (abbreviated as “RCPR”) without coal pillars has been widely implemented in Chinese coal mines. This study combines physical similarity experiments with numerical simulation to examine, before and after extraction, how roof cutting alters pressure-relief behavior and stress migration at key locations of the panel, and to formulate a mathematical model of roof-cutting-induced stress migration. Results show that roof cutting reshapes the caving structure of the overburden and improves the stress environment in critical zones. Two dominant migration paths are identified: (i) horizontal transfer from the roadway roof toward the deep coal-pillar zone and the goaf edge, and (ii) vertical transfer from lower to higher roof levels. Consequently, the surrounding rock near the roadway experiences a “dilution-weakening” effect at low levels, while middle–upper levels exhibit a “migration-storage” response. Roof cutting also narrows the stress-recovery zone at the goaf margin, enhances load-bearing of the compacted caving zone, and drives stress toward the pillar interior and goaf edge. Enforcing stress conservation, a dual-side stress-migration model (pillar side and goaf side) is established, introducing a stress-migration ratio to quantify the directionality and intensity of stress transfer. These findings refine the theoretical framework of “RCPR” mining.