特厚煤层区段煤柱宽度变化区冲击危险性分析及防治实践

The impact risk analysis and prevention practice of the coal pillar width variation area in the extra-thick coal seam

为了分析特厚煤层区段煤柱宽度变化区的冲击危险性,以大佛寺煤矿40103回风巷煤柱宽度变化区域为研究对象,通过统计分析巷道掘进过程中煤柱宽度变化前后的微震、地音监测数据,以及锚杆、锚索轴力变化情况,分析煤柱宽度变化对冲击危险性的影响规律,得出煤柱宽度变化后冲击危险性升高的原因,提出弱化静载荷源、增强煤柱稳定性和提高支护强度等冲击地压防治措施。现场监测结果表明,采取的针对性防治措施大幅降低了冲击危险性,取得了良好的防控效果,保障了掘进工作面煤柱宽度变化后的安全生产,可为类似开采技术条件下的区段煤柱区域冲击地压防治提供技术参考。

In order to analyze the impact risk of the change area of the pillar width in the extra-thick coal seam section,this paper takes the change area of the pillar width in 40103 return airway of Dafosi Coal Mine as the research object,and statistically analyzes the microseismic and geosound monitoring data before and after the change of coal pillar width,as well as the change of axial force of rockbolt and anchor cable,the influence law of the change of coal pillar width on the impact risk is analyzed,and the reason for the increase of impact risk after the change of coal pillar width is obtained,and the prevention and control measures such as weakening static load source,enhancing stability of coal pillar and improving support strength are put forward.The field monitoring results show that the targeted prevention and control measures have greatly reduced the impact risk,achieves good prevention and control effects,guarantees the safety production after the change of the width of the coal pillar on the driving face,and provides technical reference for the prevention and control of regional coal pillar impact under similar mining technology conditions.