煤炭工程 ›› 2026, Vol. 58 ›› Issue (4): 123-131.doi: 10.11799/ce202604016

• 研究探讨 • 上一篇    下一篇

中远距离倾斜煤层群保护层开采合理错距选取及卸压控制技术研究

孙凯强,何登云,杨敬轩,张永波,张 豪   

  1. 1.中国矿业大学 矿业工程学院,江苏 徐州 221116

    2.淮北矿业股份有限公司 祁南煤矿,安徽 宿州 234111

    3.中煤科工集团重庆研究院有限公司,重庆 400039

  • 收稿日期:2025-07-21 修回日期:2025-11-21 出版日期:2026-04-10 发布日期:2026-05-12
  • 通讯作者: 孙凯强 E-mail:sunkaiqiang@cumt.edu.cn

Selection of reasonable offset distance and pressure relief control for protective seam mining in medium-to-long distance inclined coal seam groups #br#

  • Received:2025-07-21 Revised:2025-11-21 Online:2026-04-10 Published:2026-05-12

摘要:

针对复杂中远距离煤层群保护层开采诱发下煤层强矿压问题,以祁南煤矿7244工作面为工程背景,采用理论分析、数值模拟及工程实践方法开展研究。研究表明:随工作面错距增大,走向与倾向最大剪应力呈显著降低趋势,并确定80m为最优错距,该错距下应力传递路径得到有效改善;基于80m错距的强矿压分布特征,提出切顶高度23m、卸压角度的协同控制技术,将最大剪应力控制在顶板抗剪强度内;实施深浅孔耦合爆破卸压方案后液压支架工作阻力峰值平均降幅达20%以上,顶板稳定性显著提升,形成错距优化-卸压控制协同技术体系。

Abstract:

To address the intense ground pressure induced by protective layer mining in complex medium-long distance coal seams, this study investigates Panel 7244 of Qinan Coal Mine through theoretical analysis, numerical simulation, and engineering practices. Key findings include: (1) Increasing the working face offset significantly reduces the strike- and dip-direction maximum shear stresses, with 80 m identified as the optimal offset to improve stress transfer pathways. (2) A coordinated control strategy combining a 28 m roof-cutting height and 0° pressure relief angle effectively confines the maximum shear stress within the roof's shear strength. (3) Implementation of a coupled deep-shallow hole blasting pressure relief scheme reduces the peak hydraulic support resistance by over 20% and enhances roof stability. The integrated "offset optimization–pressure relief control" framework provides an effective solution for safe coal seam group mining.

中图分类号: