地应力异常区上山群巷道蠕变围岩控制技术

为了解决地应力异常区上山群巷道支护困难的问题,针对常村煤矿地应力特征,模拟分析了不同方向的最大水平主应力巷道围岩应力分布规律,并分析了上山群间煤柱宽度与掘进顺序对支护方式的影响,将全长锚固预应力强力锚杆锚索组合支护系统应用于该上山群巷道。试验结果表明：地应力异常区上山群间煤柱宽度大于30 m时掘进顺序对支护无影响,采用全长锚固预应力强力锚杆锚索组合支护系统后,巷道两帮移近量最大为87 mm,顶板最大下沉量为18 mm;锚杆最大受力为183 kN,锚索最大受力为250 kN,且巷道变形量及锚杆锚索受力稳定,围岩变形得到了有效控制。

Creep Surrounding Rock Control Technology of Rise Group Roadway in Abnormal Ground Stress Zone

In order to solve the support difficult problem of the rise group roadway in abnormal ground stress zone,according to ground stress features of Changcun Mine,the stress distribution law of the surrounding rock in different directional maxium horizontal main stress roadway was simulated and analyzed.An analysis was conducted on the coal pillar width between the rise group and roadway heading sequence affected to the support mode and a full length pre-stressed power bolt and anchor combined support system was applied to the rise group roadway.The trial results showed that when the width of the coal pillars between the rise group in the abnormal ground stress zone was over 30 m,the roadway heading sequence would not affect to the roadway support.When the full length pre-stressed power bolt and anchor combined support system was applied,the two sidewall convergence value of the mine roadway would be 87 mm in maxium,the maxium subsidence of the roof would be 18 mm,the maxium stress of the bolt would be 183 kN and the maxium stress of the anchor would be 250 kN.The roadway deformation value and the stress of the bolt and anchor were stable and the deformation of the surrounding rock was effectively controlled.