CAJ | 학술논문

针对本煤层瓦斯抽采钻孔密封性差、封孔长度不够、钻孔形变较大、钻孔及周围煤体漏风严重等造成抽采瓦斯浓度偏低、衰减速度较快及稳定性差等技术难题，基于“固封液－液封气”，受限空间膨胀、渗流力学等理论，进行了钻孔及煤体密封技术的实验模拟与现场验证，研究并开发了固液耦合流体壁式密封新技术及设备。研究表明，采用固液耦合流体壁式密封技术可对抽采钻孔及周围煤体裂隙实施动态密封，最终形成粘液、裂隙及钻孔周围煤体相互耦合的立体封面，有效阻止了因抽采负压增大而导致的巷道空气通过钻孔及周围煤体裂隙向抽采钻孔的漏入，使得瓦斯抽采过程浓度稳定，单孔平均浓度提高4～5倍，显著地提高了本煤层瓦斯的抽采效率。
침대본매층와사추채찬공밀봉성차、봉공장도불구、찬공형변교대、찬공급주위매체루풍엄중등조성추채와사농도편저、쇠감속도교쾌급은정성차등기술난제，기우“고봉액－액봉기”，수한공간팽창、삼류역학등이론，진행료찬공급매체밀봉기술적실험모의여현장험증，연구병개발료고액우합류체벽식밀봉신기술급설비。연구표명，채용고액우합류체벽식밀봉기술가대추채찬공급주위매체렬극실시동태밀봉，최종형성점액、렬극급찬공주위매체상호우합적입체봉면，유효조지료인추채부압증대이도치적항도공기통과찬공급주위매체렬극향추채찬공적루입，사득와사추채과정농도은정，단공평균농도제고4～5배，현저지제고료본매층와사적추채효솔。
Considering the technical problems such as poor sealing effect, insufficient sealing length, large borehole deformation and the serious air leakage in borehole and surrounding coal body during gas drainage process in min-ing-coal bed, which have caused the lower gas concentration, the faster decay rate and poor stability, based on the theories of"sealing liquid by solid and sealing air by liquid", limited space expansion and seepage mechanics, the experimental simulation and site validation for sealing technology of borehole and coal body were conducted, and the new technology and equipment of fluid wall sealing by solid-liquid coupling were studied and developed.The results showed that applying the fluid wall sealing technology can implement dynamic sealing for drainage borehole and coal body fractures around it, and eventually form the coupled stereoscopic covers by mucus, fractures and coal body around borehole.It effectively prevented the air leakage from roadway to drainage borehole through borehole and surrounding coal body fractures caused by increasing of drainage negative pressure, and kept the constant con-centration in process of gas drainage.The average concentration of single hole was improved by 4~5 times, and the gas drainage efficiency in mining-coal bed was evidently improved.