煤矿安全2026，Vol.57Issue(7)：61-70,10.DOI:10.13347/j.cnki.mkaq.20250170
综采工作面终采线外错诱冲机理及防治技术研究
Research on mechanism and prevention technology of rockburst induced by offset of final mining lines in fully-mechanized working faces
摘要
Abstract
To reduce the stress concentration in coal mass caused by the offset of the final mining line and lower the rockburst risk during the final mining stage of such working faces,three adjacent working faces with offset final mining lines in Nalinhe No.2 Coal Mine were taken as the research object.The rockburst mechanism induced by the superposition of static and dynamic loads during the final mining period was analyzed.A mechanical model for the stress analysis of the offset roof was established.By comparing the variation characteristics of bending energy of thin plate structures with three fixed edges and one fixed adjacent edge,the stress vari-ation mechanism of the roof in the offset area was revealed.Through numerical simulation,the stress distribution curves of the coal mass ahead of the working face during single face mining and offset face mining were compared,and the stress distribution charac-teristics of the coal mass near the final mining lines of adjacent gobs were obtained.Comprehensive prevention and control measures were designed to block stress transmission,weaken dynamic load disturbance,and reduce coal mass stress,and the control effect was verified.The results show that the roof structure in the offset area of the final mining line changes from three fixed edges to one fixed adjacent edge.With the increase of the free edge length,the bending energy of the adjacent roof structure increases,which is the main reason for the increase of static load in the working face.The coal pillar corner formed by the offset final mining line is subjec-ted to the superposition of bidirectional abutment stresses,with the highest stress concentration coefficient,which is higher than the maximum stress concentration coefficient under the influence of advance abutment stress in single face mining.After implementing comprehensive rockburst prevention measures in the offset area,the microseismic energy in the final mining area is reduced by 71.0%,the microseismic frequency is reduced by 70.8%,and the maximum decrease of coal mass stress reaches 62.0%,which greatly reduces the rockburst risk during the final mining stage of the working face with an offset final mining line.关键词
冲击地压/终采线/外错工作面/诱冲机理/防治措施Key words
rockburst/final mining line/offset working face/rockburst triggering mechanism/prevention and control measures分类
矿业与冶金引用本文复制引用
赵毅,韩刚,潘涌治,昝东峰..综采工作面终采线外错诱冲机理及防治技术研究[J].煤矿安全,2026,57(7):61-70,10.基金项目
国家自然科学基金资助项目(52174116) （52174116）
