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针对巷道壁面和瓦斯抽采钻孔周围都有裂隙,且受采动影响动态变化,裂隙沟通后形成漏气通道的技术难题,提出了在孔内注浆封堵,在孔口的巷道壁上喷涂1层防渗材料的“封隔一体化”封孔技术。分析了钻孔周围裂隙带特征,研究了优势漏风通道形成机制,阐述了封隔一体化技术的原理,设计隔断层密封性相似实验,研究了不同形态的隔断层对钻孔的密封效果。研究结果表明:填充隔断层后的密封效果远强于未填充的情况;隔断层面积和厚度越大,负压值越高,衰减越慢,密封效果越好。封隔一体化封孔技术应用于平煤十三矿,试验结果表明:封隔一体化封孔技术密封性能优异,显著地提高了瓦斯抽采浓度。
Aiming at the technical problems that the tunnel walls and the gas drainage borehole all have fissures around, and the dynamic changes of the tunnel due to the mining influence and the fissure communication to form the air leakage channel, a grouting plugging in the hole is proposed, 1 layer of anti-seepage material spraying “seal integration ” sealing technology. The characteristics of the fracture zone around the borehole were analyzed. The formation mechanism of the dominant air leakage passageway was studied. The principle of the seal integration technique was expounded. Similar experiments on the seal of the barrier layer were designed. The sealing effect of different forms of the fracture layer on the borehole was also studied. The results show that the sealing effect after the barrier layer is filled is much stronger than that of the non-filled layer. The larger the area and thickness of the barrier layer, the higher the negative pressure value, the slower the attenuation, the better the sealing effect. Packaged integrated sealing technology used in Pingdingshan No. 13 mine, the test results show that: Packaged sealing technology sealing performance is excellent, significantly improve the concentration of gas extraction.