煤矿安全2024，Vol.55Issue(3)：46-52,7.DOI:10.13347/j.cnki.mkaq.20230845
远距离下保护层开采遗留煤柱对被保护层回采的影响研究
Study on the influence of coal pillar left by long-distance mining of protected layer on the mining of protected layer
摘要
Abstract
In order to study the influence of the coal pillar left over from the mining of the protective layer over a long distance on the mining effect of the protected layer,the coal pillar and Ⅳ5-6-22190 working face of the section with a remaining width of 4 m between Ⅴ8-22310 machine lane and Ⅴ8-32010 air lane of Ⅴ8 coal seam in Pingdingshan No.6 mine are taken as the research object,by means of theoretical analysis,numerical simulation and field measurement,the influence range of coal pillar,the distribution of vertical stress in coal pillar region and the variation law of related parameters in the influence region are studied.The results show that the influence range of 4 m wide residual coal pillar is 27.3 m,the ultimate strength is 25.9 MPa,the plastic zone width is 2.26 m,and the elastic zone width is 2.68 m.When the working faces on both sides of the coal pillar are mined,the maximum vertical stress of the coal pillar is 87.9MPa,which far exceeds the load limit of the coal pillar itself;there is no obvious difference between the re-sidual gas content and pressure measured in the coal pillar influence area and the pressure relief protection area,and they are all less than the critical value of outburst danger,and the gas is released well in the coal pillar influence area;there is no obvious stress con-centration phenomenon in the influence range of the coal pillar,the small coal pillar left behind has little influence on the protected effect,the protection effect has continuity in trend,and the influence on the working face of the protected layer is little.关键词
煤岩动力灾害/保护层开采/煤柱影响区/残存煤柱/保护范围Key words
coal or rock dynamic disasters/protective layer mining/coal pillar affected area/residual coal column/scope of protection分类
矿业与冶金引用本文复制引用
陈学习,盛贵松,高泽帅..远距离下保护层开采遗留煤柱对被保护层回采的影响研究[J].煤矿安全,2024,55(3):46-52,7.基金项目
国家自然科学基金资助项目(52174181) （52174181）
