含软弱夹矸煤层巷道滑移失稳机理及支护对策  

Mechanism and control countermeasures of roadway slippage and instability in coal seam with weak gangue

作　　者：陈晓庆 CHEN Xiaoqing(Huozhou Coal power Group Dadi Coal Industry Co.,LTD.,Jixian042202,China)

机构地区：[1]霍州煤电集团大地煤业有限公司,山西吉县042202

出　　处：《煤矿现代化》2022年第3期78-81,85,共5页Coal Mine Modernization

摘　　要：桑峨煤矿2、3号煤层为极近距离合采煤层,中间含有软弱夹矸层,为防止回采巷道煤柱帮在采动影响下出现整体滑移、片帮等事故,通过现场围岩观测、夹矸层矿物成分分析及数值模拟等方法探究了巷道副帮滑移失稳机理。结果表明:泥岩夹矸层中的蒙脱石及高岭石含量较高,分别为57%、25%,不利于支护;巷道顶板受相邻工作面侧向支承压力的影响,产生大量垂直裂隙,并带动巷帮上部沿夹矸层面向采空区侧滑移,发生变形失稳。基于巷道失稳机理,提出针对性的支护对策,取得了良好的效果。The No.2 and No.3 coal seams of Sang’e Coal Mine are coal seams which are mined at very close distances,with weak gangue layers in the middle.In order to prevent accidents such as overall slippage and fragmentation of the coal pillar sill in the mining roadway under the influence of mining.Through on-site observation of surrounding rock,mineral composition analysis of gangue layer and numerical simulation,the mechanism of sliding and instability of roadway auxiliary slab is explored.The results show that the contents of montmorillonite and kaolinite in the mudstone intercalated gangue layer are relatively high,57%and 25%,respectively,which are not conducive to support.The roof of the roadway is affected by the lateral support pressure of the adjacent working faces,producing a large number of vertical cracks,and driving the upper part of the roadway to slide along the side of the gangue layer facing the goaf,causing deformation and instability.Based on the mechanism of roadway instability,targeted support countermeasures have been proposed and good results have been achieved.

关 键 词：软弱夹矸 极近距离 煤层巷道 滑移失稳 

分 类 号：TD353[矿业工程—矿井建设]