恒昇煤业窄煤柱回采巷道变形破坏特征与支护优化技术研究

Research on Deformation and Failure Characteristics of Narrow Coal Pillar Mining Roadway in Hengsheng Coal Mine and the Support Optimization Technology

为解决恒昇煤业9102工作面沿空掘进巷道受采空区覆岩运动的影响,巷道变形迅速,位移量大,矿压显现剧烈的问题。通过现场围岩变形观测、钻孔窥视、瑞利波探测等手段对恒昇煤业9102工作面机巷实施监测。瑞利波探测顶板结果表明岩体结构异常区域分布在1~1. 5m、2~5m处,分析顶板钻孔窥视图像得到孔壁在1. 5m、3m、4m附近破坏严重,顶板离层仪在2~3m、3~5m出现离层,根据监测结果对支护参数优化并进行工业性试验,结果表明:优化后的9102机巷围岩变形量小,测点距迎头140m时,顶底板位移量77mm,两帮位移量98mm,巷道支护效果明显。

The gob-side tunneling roadway in the 9102 working face of Hengsheng Coal Mine is affected by the overburden movement in goaf,the tunnel deformation is rapid,the displacement quantity is large,and the mine pressure behavior is intense.Field surrounding rock deformation observation,drilling peep,Rayleigh wave detection and other means are used in the working face machine lane monitoring.Rayleigh wave roof detection indicates that the abnormal area of rock mass structure is distributed in 1~1.5 m and 2~5 m area,according to the drilling peep image the damage of roof is serious near 1.5 m and3 m,the collapse hole appears at 4 m,according to the roof off-layer instrument off-layer appears in 2~3 m and 3~5 m.According to the monitoring results,the supporting parameters are optimized and tested,and the results show that:the deformation of the surrounding rock of 9102 machine lane is small,the displacement of the roof and floor is 77 mm when the measuring point is 140 m,the displacement of the two pairs is 98 mm,and the roadway support effect is obvious.