穿层瓦斯抽采钻孔有效性评价与二次堵漏技术研究  

Study on the evaluation of effectivenessof cross-seam gas drainage boreholes and secondary plugging technology

作　　者：郭治兵 胡祖祥[1] GUO Zhibing;HU Zuxiang(School of Safety Engineering,Anhui University of Science and Technology,Huainan 232000,China)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232000

出　　处：《华北科技学院学报》2024年第5期6-11,共6页Journal of North China Institute of Science and Technology

基　　金：工业粉尘防控与职业安全健康教育部重点实验室(EK20211001)。

摘　　要：为解决底抽巷穿层钻孔瓦斯抽采浓度衰减快、浓度低的问题,以河南平顶山十矿己15-17-33190工作面为研究对象,研发了定点漏气检测装置,并采用了绝对漏风率指标,提出了一套钻孔瓦斯漏气的定量评价标准,以判定钻孔密封质量,从而确定“有效孔”。针对失效钻孔,提出并应用了破孔堵漏修复技术。对注浆修复后的瓦斯抽采钻孔进行检测与分析,结果表明:在距离孔口19.5 m以外的测点,平均瓦斯浓度达到70%以上,在距离孔口15 m到19.5 m的区间范围内,瓦斯浓度随着与孔口距离的减少而显著降低。15 m以内漏气位置不明显,二次修复区段可确定为15~19.5 m。修复后钻孔瓦斯浓度提升1~3倍,孔口瓦斯浓度达到52%~72%。瓦斯纯量提升超过1倍。提出的钻孔瓦斯漏气评价方法与修复技术为瓦斯治理提供了参考依据。In order to solve the problems of fast attenuation and low concentration of gas extraction in the bottom extraction roadway.The research focuses on the working face 15-17-33190 of the Pingdingshan No.10 Mine in Henan Province.A dedicated gas leakage detection device is developed and an absolute leakage rate index is employed.A quantitative evaluation standard for gas leakage in boreholes is established to assess the sealing quality and determine“effective boreholes”.For ineffective boreholes,a hole-plugging and leakage-repairing technology is proposed and applied.Post-grouting repairs are inspected and analyzed for gas drainage boreholes.Results indicate that at measurement points 19.5 meters away from the borehole mouth,the average gas concentration exceeded 70%.Within the range of 15 meters to 19.5 meters from the borehole mouth,gas concentration decreased significantly with proximity to the mouth.Leakage within 15 meters is not prominent,defining the repair segment as 15 to 19.5 meters.After repairs,gas concentration in the boreholes increased by 1 to 3 times,with gas concentrations at the borehole mouth reaching 52%to 72%.The gas purity is increased by more than 1 times.The proposed evaluation method and repair technology of drilling gas leakage provide a reference basis for gas control.

关 键 词：瓦斯抽采 钻孔修复 抽采失效 漏气检测 漏风规律 

分 类 号：TD712.6[矿业工程—矿井通风与安全] TD713.32