动力扰动下不同硬度煤层巷道围岩响应特征研究

The response features of roadway surrounding rock in different hardness coal seams under dynamic disturbance

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 study the influence principles of dynamic disturbance on roadway surrounding rock in different hardness coal seams, the paper numerically analyses the stress response of roadway surrounding rock under dynamic disturbance. The results demonstrate that the average period that the dynamic disturbance has effect on the steady of rock is 0.4 s. The soft coal＇s is more serious than the hard coal＇s when compared with the horizontal stress amplitude of roof rock and the deformation of roof and side roadway. However, the hard coal＇s is more serious than soft coal＇s when compared with the vertical stress amplitude of side roadway, the horizontal stress amplitude of floor rock, the deformation of floor rock and the plasticity zone of floor and side roadway. The deformation of roof rock is more se- rious than that of floor and side roadway in two kinds of coal seam, and in soft coal seam the deforma-tion of side roadway is more serious than that of floor rock. During the increasing period of roadway deformation, the rate of rise is different in side roadway and floor roadway, but is same in roof rock.