Scholarlink

<p>The horizontal sublevel mining of near-vertical coal seams is confronted with the problems of complex stress evolution and frequent dynamic disasters. This study comprehensively employs theoretical analysis, numerical simulation, and physical simulation to explore stress distribution characteristics and overlying strata movement laws. By introducing stress recovery and concentration coefficients, a support pressure calculation model is constructed to analyze strike and dip direction stress distribution mechanisms, identify the root causes of dynamic disasters, and reveal the gestation mechanism of dynamic disasters in near-vertical coal seam mining. The research shows that mining sublevel height significantly influences mining-induced stress. Compared with 25&#xa0;m and 30&#xa0;m sublevel heights, a 35&#xa0;m sublevel height reduces the vertical stress peak ahead of the working face and alleviates horizontal stress concentration, effectively lowering dynamic disaster risks. In strike stress distribution, the stress changes of the roof and floor in different coal seams show differentiated characteristics; the stress increases in the B3 + 6 coal seam with significant floor increments and tends to be symmetric, while stresses in the B1 + 2 coal seam decrease and transfer to the roof. In dip direction stress distribution, the stress of the roof and floor in the B3 + 6 coal seam increases with downward peak shifts, whereas the B1 + 2 coal seam shows opposite trends. Similarity simulation experiments confirm that roof–floor integrity is good in the early mining stage. With mining progression, the roof predominantly undergoes toppling failure, and intermediate rock pillars experience deflection, posing dynamic disaster risks. Alternating mining causes strain surges in the B1 + 2 coal seam roof, with strain differences increasing gradually, indicating rock pillar prying toward the goaf. This study provides critical theoretical and technical support for safe, efficient mining and dynamic disaster prevention in near-vertical coal seams.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on stress evolution characteristics and overlying strata movement laws of horizontal sublevel mining in near-vertical coal seams

  • 期刊论文

  • 发表日期：

    2025年8月20日

查看全文
  • Qiang Li,
  • Shengli Yang,
  • Hao Yue,
  • Jian Zhang

摘要

The horizontal sublevel mining of near-vertical coal seams is confronted with the problems of complex stress evolution and frequent dynamic disasters. This study comprehensively employs theoretical analysis, numerical simulation, and physical simulation to explore stress distribution characteristics and overlying strata movement laws. By introducing stress recovery and concentration coefficients, a support pressure calculation model is constructed to analyze strike and dip direction stress distribution mechanisms, identify the root causes of dynamic disasters, and reveal the gestation mechanism of dynamic disasters in near-vertical coal seam mining. The research shows that mining sublevel height significantly influences mining-induced stress. Compared with 25 m and 30 m sublevel heights, a 35 m sublevel height reduces the vertical stress peak ahead of the working face and alleviates horizontal stress concentration, effectively lowering dynamic disaster risks. In strike stress distribution, the stress changes of the roof and floor in different coal seams show differentiated characteristics; the stress increases in the B3 + 6 coal seam with significant floor increments and tends to be symmetric, while stresses in the B1 + 2 coal seam decrease and transfer to the roof. In dip direction stress distribution, the stress of the roof and floor in the B3 + 6 coal seam increases with downward peak shifts, whereas the B1 + 2 coal seam shows opposite trends. Similarity simulation experiments confirm that roof–floor integrity is good in the early mining stage. With mining progression, the roof predominantly undergoes toppling failure, and intermediate rock pillars experience deflection, posing dynamic disaster risks. Alternating mining causes strain surges in the B1 + 2 coal seam roof, with strain differences increasing gradually, indicating rock pillar prying toward the goaf. This study provides critical theoretical and technical support for safe, efficient mining and dynamic disaster prevention in near-vertical coal seams.