高瓦斯松软煤层钻孔加固密封技术研究

为解决高瓦斯松软煤层瓦斯抽采钻孔孔口失稳这一重要难题,通过研究高瓦斯松软煤层中钻孔封孔段失稳机理及钻孔孔周裂隙场及位移情况,将传统技术及加固技术导致钻孔失稳的理论进行对比分析|得出了在封孔初期对封孔段实施固化能够增大周边煤体的主动支护作用的结论,基于分析结果提出了采用“大孔径”打孔护壁注浆+“小孔径”打孔的新型孔口加固密封技术|最后,在潞安集团古城煤矿S1303主运输大巷进行加固密封技术的现场验证,实验结果表明30d后单孔瓦斯浓度提升约30%,加固技术很好地解决了钻孔孔口失稳变形导致的瓦斯抽采管难以送入指定位置的问题。

Research on Reinforcement and Sealing Technology of High Gas Soft Coal Seam

In order to solve the important problem of hole-hole collapse in high-gas soft coal seam, firstly, by studying the mechanism of hole-sealing in high-gas soft coal seam, studying the fracture field and displacement of the hole-sealing section, comparing and analyzing the theory of hole-sealing by traditional drilling technique and reinforcement technique, secondly, the theory of hole-sealing with "large" wall-grouting "hole-sealing technique is put forward. Finally, in Lu'an Group Gucheng Coal Mine S1303 tape transport for the field verification of sealing technology, the experimental results show that the reinforcement technology is a good solution to the hole deformation caused by unstable gas drainage pipe difficult to send into the designated location.