煤矿安全2025，Vol.56Issue(11)：9-17,9.DOI:10.13347/j.cnki.mkaq.20240732
钻孔割缝注浆受载体破坏特征与裂隙扩展研究
Study on failure characteristics and fracture propagation of load-bearing body in borehole slitting and grouting
摘要
Abstract
Borehole grouting for sealing the holes is one of the main technical means for gas extraction,the quality of hole sealing directly determines the extraction effect.In order to improve the effect of grouting and plugging,the collected rock samples were drilled and slit,and the rock samples with different numbers of slits were grouted and plugged to make slit grouting specimens,and based on the coal-rock triaxial compression test system,triaxial compression mechanical test was carried out on the specimens to get the compression strengths of grouted specimens with different numbers of slits.The industrial CT scanning equipment was used to scan the compressed specimens to get the two-dimensional fracture network characteristics of the specimens after destruction,and AVIZO image analysis software was used to identify the CT scanning results of different specimens and analyze the two-dimension-al development characteristics of the fracture of different specimens after compression,and at the same time,VG Studio MAX im-age analysis and processing software was used to carry out three-dimensional reconstruction,and analyze the number of slits and fracture rate of the specimens,fractal dimension and Euler number.The results show that:the data of slits directly affect the mechan-ical properties of the borehole grouting specimens,with the increase of the number of slits,the strength of the specimens is weakened;according to the industrial CT scanning results of the damaged specimens,the analysis of the development of the cracks,and the complexity and connectivity of the fracture network found that the slits have a guiding role in the expansion of fracture de-velopment of the load-bearing body,and the predominant angle of the development of pore cracks is±45 °,and the development of cracks in this direction is more prominent;with the increase of the number of slits,the development of fractal dimension and Euler number are more prominent;the fracture rate and 3D fractal dimension increase linearly with the increase of the number of slits,while the Euler number decreases linearly with the increase of the number of slits in the boreholes.The grouting of slits in boreholes is conducive to improving the quality of hole sealing,but too many cut slits will deteriorate the quality of hole sealing.关键词
钻孔注浆/钻孔工艺/割缝注浆/裂隙发育/CT扫描/钻孔抽采/瓦斯治理Key words
drilling and grouting/hole sealing technology/slit grouting/fracture development/CT scanning/borehole extraction/gas control分类
矿山工程引用本文复制引用
费浩,朱熹,程松,雷世刚,李泽文,潘荣生,王登科,白云,曹塘根..钻孔割缝注浆受载体破坏特征与裂隙扩展研究[J].煤矿安全,2025,56(11):9-17,9.基金项目
国家自然科学基金资助项目(52174174) （52174174）
河南省高等学校重点科研项目计划基础研究专项资助项目(21zx004) （21zx004）
河南理工大学创新团队计划资助项目(T2022-1) （T2022-1）
