以余吾矿N2105工作面回采过程中进风顺槽发生的2次严重底板冲击事故为研究对象,建立巷道底板破坏模型,并数值模拟应力集中系数大小与底板塑性区的关系。研究表明:应力集中系数越高,底板越容易发生破坏;大直径钻孔卸压能够有效地抑制底板变形破坏。 Taking the two severe floor impact accidents occurring in the wind inlet slot of N2105 working face during the recovery of Yuyu mine as the research object, the roadway floor failure model was established and the relationship between the stress concentration factor and the plastic zone of the floor was numerically simulated. The results show that the higher the stress concentration factor, the more prone to damage the bottom plate; large diameter borehole pressure relief can effectively suppress the deformation of the floor.