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为了探讨动力扰动对不同硬度煤层巷道围岩稳定性的影响规律,对动力扰动下不同硬度煤层巷道围岩力学响应进行了数值分析。结果表明:动力扰动对软硬煤煤层巷道围岩稳定性显著影响时间为0.4 s;在巷道顶板水平应力波动幅值、顶板及帮部围岩变形程度方面,软煤大于硬煤,而在帮部垂直应力波动幅值、底板水平应力波动幅值、底板变形程度及帮部和底板的塑性区面积方面,硬煤大于软煤;软硬煤煤层巷道顶板变形程度均大于底板和帮部,软煤帮部变形程度明显大于底板;在巷道变形位移显著上升时间段内,软硬煤煤层巷道帮部和底板位移变化速率不一致,而顶板位移变化速率一致。
In order to investigate the influence of dynamic disturbance on the stability of surrounding rock in roadway with different hardness, the numerical analysis of surrounding rock mechanics response of roadway with different hardness was carried out. The results show that dynamic disturbance has a significant effect on the stability of surrounding rock in soft and hard coal seam roadway for 0.4 s. Soft rock is larger than hard coal in the level of horizontal stress fluctuation of roof and roof, The amplitude of vertical stress fluctuation, the amplitude of floor horizontal stress fluctuation, the deformation degree of the floor and the plastic zone area of the gangue and the floor, the hardness of hard coal is higher than that of soft coal; The deformation degree of coal gangue is obviously greater than that of the floor. During the period when the deformation and displacement of the roadway is significantly increased, the displacements of gangway and floor of soft and hard coal seam are inconsistent, while the rate of roof displacement change is the same.