基于高强吸能锚杆支护的煤柱合理留设尺寸研究

Reasonable coal pillar size supported by high strength energy-absorbing rock bolt

为了提高煤炭回采效率、实现正常回采和顺利完成工作面安全接替的生产要求,针对经纺煤业3-508综放工作面25m煤柱尺寸进行优化,自主设计研发了高强稳阻吸能锚杆,并对其力学特性进行了试验研究,提出了高强稳阻支护方案,通过FLAC3D模拟不同支护方案和不同煤柱尺寸下的巷道围岩垂直应力变化、塑性区分布规律和巷道变形差异对比得出结论。研究表明:与经纺煤业现有支护方案对比,采用新型高强稳阻吸能锚杆支护技术可以提高巷道围岩的稳定性,将原有25m煤柱尺寸缩减为5~10m,减少了煤炭资源的浪费。研究结果可以为经纺煤业留设合理煤柱尺寸和巷道稳定性控制提供指导意见和科学依据。

According to the production requirements of improving coal recovery efficiency,ensuing continuous normal production and safe working face succession,the 25m coal pillar of 3-508 fully mechanized caving face in Jingfang Coal Mine is optimized and a new high-strength stable-resistance energy-absorbing rock bolt is developed and its mechanical properties are investigated.A simulation model in the mining process is established by FLAC3D to study the differences of the surrounding rock stress,deformation and plastic zone distribution law under different pillar widths and support methods.The results show that,compared with the current support,the new support technology can improve the surrounding rock stability for the roadway,and the coal pillar width can be decreased to 5~10m supported by the new rock bolt,so more coal resource can be exploited.The results can guide the design of coal pillar width and the control of surrounding rock in Jingfang Coal Mine.