关键词: 地应力, 双硬厚煤层, 数值模拟, 侧压系数, 围岩稳定性

Abstract: Aiming at the problem of surrounding rock stability of mining roadway easily caused by the mining process of double hard thick coal seam，based on the production geological conditions of a mine in Aai mining area，the influence of in-situ stress distribution characteristics on the stability of surrounding rock of mining roadway in thick and hard coal seam with hard roof is systematically analyzed by combining in-situ stress measurement with FLAC3D numerical simulation. The results show that the in-situ stress in the mining area is mainly horizontal stress，and the in-situ stress field belongs to the type of tectonic stress field. The relationship between the principal stress is the maximum horizontal principal stress（σH）>the minimum horizontal principal stress（σv ）> the vertical principal stress（σh ），and the lateral pressure coef‐ ficient is 1.38~1.50. The principal stress value increases linearly with the increase of buried depth. The horizontal displacement of the surrounding rock of the left and right sides of the roadway is asymmetric. The horizontal displacement of the left side is slightly smaller than that of the right side（caused by the 12° dip angle of the coal seam ）. The larger the lateral pressure coefficient，the larger the maximum principal stress of the surrounding rock of the roadway，the larger the horizontal displacement，the smaller the verti‐ cal displacement of the roof and floor，and the larger the plastic zone of the surrounding rock. Under the condition of different lateral pressure coefficients，the surrounding rock of the roof and floor of the roadway is mainly shear failure，and the surrounding rock of the two sides is mainly tensile failure and shear failure.The plastic zone of the surrounding rock of the right side is larger than that of the left side. On the whole， the damage degree of surrounding rock of roadway roof is the most serious and the damage range is the larg‐ est. The damage degree and range of surrounding rock on the right side are greater than those on the left side. The research results can provide theoretical reference for surrounding rock stability control and sup‐ port scheme optimization of mining roadway in similar double hard thick coal seam.

Key words: in-situ stress, double hard thick coal seams, numerical simulation, lateral pressure coef‐ ficient, surrounding rock stability