以某矿N_2105工作面回采过程中进风巷穿过向斜构造区发生的2次底板冲击为研究对象,理论分析了巷道底板失稳破坏机理,并数值模拟了水平应力集中系数与底板塑性区的变化关系。研究结果表明:水平应力集中系数越高,底板越容易产生滑移变形鼓起;底板的冲击破坏是动静载叠加引起的;煤体大直径钻孔卸压能够有效卸压,从而抑制巷道底板冲击。 Taking the impact on the secondary floor slab that occurs in the air-entry lane through the syncline in the gas-entry tunnel of N_2105 working face in a mine as the research object, the failure mechanism of the floor of the roadway is analyzed theoretically. The horizontal stress concentration coefficient and the plastic zone The relationship between the changes. The results show that the higher the horizontal stress concentration coefficient is, the more prone the baseplate is the bulging of slip deformation. The impact damage of the base plate is caused by the dynamic and static load stacking. The relief of large-diameter coal bores can effectively relieve the pressure of the roadway floor .