平顶山矿区上伏遗留煤柱对下伏煤层应力响应机制研究

Stress response mechanism of residual coal pillars to underlying coal seam in Pingdingshan mining area

平顶山矿区上覆戊组煤层群开采过程中遗留的上下山大型煤柱,对下伏己组煤层巷道掘进以及开采过程中顶板压力和煤层赋存状态具有重要影响。为研究上伏遗留煤柱对下伏煤层的影响,采用锚杆应力计对顶板的应力进行研究。根据下伏煤层巷道锚杆应力的现场原位监测,可将上伏遗留煤柱对下伏煤层的应力影响划分为三个区域:影响微弱区(Ⅰ区)、影响剧烈区(Ⅱ区)、稳定影响区(Ⅲ区)。并通过FLAC3D软件模拟分析了影响区内的应力变化趋势,验证了上伏遗留煤柱对下伏煤层的影响规律。研究成果可为下伏己组煤层掘进与回采通过煤柱时的顶板管理、瓦斯治理及防突措施提供理论依据和现场指导。

In Pingdingshan mining area,the large coal pillars left over from the mining process of the coal seam group of the upper and lower strata have an important influence on the tunneling of the coal seam group of the lower strata and the roof pressure and coal seam occurrence state in the mining process. In order to study the influence of the residual pillars on the underlying coal seam,the roof stress is studied using bolt stress meter. According to the in-situ monitoring of the bolt stress in the roadway of the underlying coal seam,the influence area of the residual coal pillar on the stress of the underlying coal seam can be divided into three areas: the weak influence area( area Ⅰ),the intense influence area( area Ⅱ) and the stable influence area( area Ⅲ) . Through FLAC3 Dsimulation,the trend of stress change in the affected area is analyzed,and the influence rule of the residual coal pillar on the underlying coal seam is verified. The research results can provide theoretical basis and on-site guidance for roof management,gas control and outburst prevention measures for driving and mining in the underlying coal seam beneath coal pillars.