大断面切眼支护解除对围巷稳定性影响分析

 大断面切眼锚网支护在综放工作面开切眼的应用效果良好，但由于锚杆锚索的悬吊作用造成老顶不能及时垮落，对邻近巷道稳定造成了一定的影响，本文针对这个问题运用理论分析和数值模拟的方法并结合现场观测，研究了综放开切眼锚网索联合支护解除对围岩支承压力和巷道变形的影响，结果表明：切眼锚网支护解除能使切眼顶板随工作面推进而垮落，缩短采场老顶初垮步距，使得分配到排水巷与切眼间煤柱上的支承压力明显下降，切眼后排水巷围岩变形明显减小，有利于切眼后排水巷围岩稳定。本文研究结论对指导采空区周围巷道围岩变形控制有重要的参考意义。

Analysis on Support Released of Large Cross-Section Open-Off Cut Affected to Stability of Surrounding Roadways

The bolt-net support technology has good effect in big cross-section open-off cut of fully mechanized top coal caving mining face, but as a result of bolt and cable suspension, the roof can not collapse timely, it caused a certain impact on the vicinal tunnel stability, aiming at solving this problem, by means of theory , numerical simulation and site observation, the effect to coal pillar supporting stress and wall rock deformation of bolt-net release in fully mechanized top coal caving is analysed. The results show that open-off cut bolt-net release can make the roof collapse along with work face advance, shorten old roof 1st collapse distance, decrease coal pillar stress between drainage tunnel and open-off cut, reduce drainage tunnel deformation, is conducive to the drainage tunnel stability controlling. This paper conclusion has a significant reference meaning to direct tunnel deformation controlling around the goaf.