Abstract:In order to clarify the deformation and failure law of semi-coal rock roadway in thin coal seam, taking Chahe Coalmine as the engineering background, the fundamental cause of deformation and failure of semi-coal rock roadway is studied through theoretical analysis, and the failure and deformation law of semi-coal rock roadway under different coal-rock ratio is analyzed through numerical simulation. The results show that the deformation and failure of semi-coal roadway largely depend on the buried depth of roadway and the cohesion of surrounding rock, and the coal seam of two sides of roadway is the first to fail, and its failure depth is greater than that of other surrounding rock of roadway. With the increase of the proportion of coal to rock in semi-coal roadway, the plastic zone of surrounding rock becomes larger and larger, the range of high stress formed by surrounding rock becomes larger, and the horizontal displacement of two sides of roadway increases significantly. The peak displacement is mainly concentrated in the two sides of roadway coal seam, and the overall displacement of surrounding rock also increases gradually, especially the two sides of roadway coal seam. The increase of the proportion of coal and rock in semi-coal roadway is more likely to cause the roadway structure instability, the research results can provide some theoretical guidance for parameter layout of semi-coal roadway.
