厚煤层综放面准备巷道保护煤柱的尺寸优化研究

Study on Size Optimization of Protective Coal Pillar in Preparation Roadway of Fully Mechanized Caving Face of Thick Coal Seam

针对厚煤层综放面停采后在工作面后方形成悬臂结构,进而传递覆岩应力,导致煤柱内超前应力影响范围广,需留设较大尺寸煤柱护巷而导致煤炭资源浪费。以常村煤矿2106工作面为背景,采用理论分析、数值模拟、现场实测相结合的方法对厚煤层综放面末切顶及合理停采位置进行研究。得出不切顶情况下煤柱留设尺寸应大于70 m,切顶后煤柱留设尺寸可优化至60 m.现场应用停采线距离准备巷道60 m,并对2106工作面对应的区域进行矿压监测,监测结果表明,切顶后巷道围岩变形量较小,在服务周期内可稳定使用,研究结果可为同类工程提供有益参考。

After the stoppage of fully mechanized caving face of thick coal seam, the cantilever structure is formed behind the working face to transfer the overburden stress, which leads to a wide range of influence of advanced stress in coal pillar, and it is necessary to set large size coal pillar to protect the roadway, resulting in waste of coal resources.Taking the 2106 working face of Changcun Coal Mine as the background, the method combining theoretical analysis, numerical simulation and field measurement is used to study the final top cutting and reasonable stoping position of fully mechanized caving face of thick coal seam.It is concluded that the coal pillar retaining size should be greater than 70 m without cutting the top, and the coal pillar retaining size can be optimized to 60 m after cutting the top.The stop-mining line is 60 m away from the prepared roadway, and the corresponding area of 2106 working face is monitored by mine pressure.The monitoring results show that the roadway surrounding rock deformation is small after the roof cutting, and it can be used stably in the service cycle.The research results can provide useful reference for similar projects.