摘要
Abstract
Under the influence of dynamic pressure action,the deformation of the roadway in Zhenchengdi Coal Mine is severe,which increases the difficulty of roadway maintenance.In order to improve the stability of the roadway surrounding rock,the influence laws of the compression load of the direct roof and gangue,as well as the length of the roof cantilever beam,are studied.Goaf roadway covering layer structural model and coal pillar stress model under dynamic pressure action are established.The influence of the thickness,hardness,and deformation of the direct roof on the stability of the goaf is analyzed,and theoretical criterion for the stability of the"groove beam"structure and coal pillar under dynamic pressure action are proposed.Based on the geological conditions of the 22305 fully mechanized mining face in Zhenchengdi Mine,optimization measures are taken from the aspects of roof cutting and pressure relief,coal pillar design,surrounding rock reinforcement and so on.The results show that the width of the coal pillars is reduced from 15 m to 4 m by using grouting anchor cable beams to reinforce the roof and implementing bidirectional grouting anchor cables to reinforce narrow coal pillars;The deformation of the roadway roof and two sides is 268 mm and 105 mm,respectively,and the stress concentration coefficient of the coal pillar is 1.20,effectively achieving stability control of the goaf roadway covering layer and coal pillar.关键词
上覆岩层稳定性/煤柱设计/围岩控制Key words
overburden rock stability/coal pillar design/surrounding rock control分类
矿业与冶金
