高瓦斯松软煤层钻孔加固密封技术研究  

Reinforcement and sealing technology for drilling in high gas soft coal seam

作　　者：杨计先 程仁辉 张超[2] YANG Ji-xian;CHENG Ren-hui;ZHANG Chao(Zhangcun Coal Mine,Lu’an Group Co.,Ltd.,Changzhi 046000,China;College of Energy Resources,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]山西潞安环保能源开发股份有限公司,漳村煤矿,山西长治046000 [2]西安科技大学安全学院,陕西西安710054

出　　处：《煤炭工程》2020年第12期71-75,共5页Coal Engineering

摘　　要：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。Aiming at the borehole instability in high gas and soft coal seam,the instability mechanism of borehole sealing section in high gas and soft coal seam and the fracture field and displacement around the borehole are studied,the theory of borehole instability caused by traditional technology and reinforcement technology are compared,and it is concluded that,the borehole sealing in high gas and soft coal seam is unstable,a new type of hole reinforcement and sealing technology is proposed,which uses large diameter drilling for grouting and small hole diameter drilling for sealing.Finally,the reinforcement and sealing technology is verified in s1303 main transportation roadway of Gucheng Coal Mine.The experimental results show that,the gas concentration of single hole is increased by 30%30 days later,the reinforcement technology can solve the problem that the gas drainage pipe is difficult to be sent to the designated position due to the instability and deformation of the borehole orifice.

关 键 词：高瓦斯 松软煤层 钻孔失稳 加固密封 瓦斯抽采 注浆密封 

分 类 号：TD712+.6[矿业工程—矿井通风与安全]