基于钻孔窥视的酥软煤体沿空巷道超前支护技术研究

Research on Advanced Support Technology of Gob-side Entry in Soft Coal Based on Drilling Peep

为研究酥软沿空巷道的围岩控制难题,以中马村矿3900沿空巷道为研究对象,通过对工作面顶板以及帮部围岩进行钻孔窥视及分析,以提出相应的巷道补强支护方案。钻孔窥视结果表明,工作面顶板以上16 m范围内围岩整体坚硬完好,局部围岩裂隙发育,巷道440 m以里沿空侧3.6 m全煤,围岩整体较好;巷道440 m以外沿空侧2.5 m全煤,围岩整体较破碎;在回采扰动下,松软煤体支护困难。采用两巷超前段补打锚索补强支护代替单体柱配π钢梁支护,以主动支护代替被动支护;针对巷道帮部施工普通锚索期间钻孔易塌孔造成装锚固剂困难的问题,将3900工作面帮部锚索由普通锚索改为注浆锚索。研究结果为中马村矿沿空巷道的围岩控制提供指导。

In order to study the surrounding rock control problem of the soft gob-side entry,the 3900 gob-side entry of Zhongmacun Coal Mine was taken as the research object.Through the drilling and peeping of the roof and the surrounding rock of the working face,the corresponding roadway reinforcement support scheme was proposed by analyzing the drilling and peeping results.The results of drilling peep show that the surrounding rock is generally hard and intact in the range of 16 m above the roof of the working face,and the local surrounding rock cracks are developed.The whole coal is 3.6 m in the gob side of the roadway 440 m,and the surrounding rock is good as a whole.The whole coal is 2.5 m away from 440 m of the roadway,and the surrounding rock is broken as a whole.Under the disturbance of mining,the support of soft coal is diffi⁃cult.The anchor cable reinforcement support in the leading section of the two roadways is used to replace the single column withπsteel beam support,and the active support is used to replace the passive support.In view of the difficulty of installing anchoring agent caused by borehole collapse during the construction of or⁃dinary anchor cable in roadway side,the anchor cable of 3900 working face was changed from ordinary an⁃chor cable to grouting anchor cable.The research results provide guidance for the surrounding rock control of the roadway along the goaf in Zhongmacun Coal Mine.