顶板断裂产生的冲击载荷对深井巷道围岩变形的数值计算研究

Study on Numerical Calculation for Surrounding Rock Deformation of Roadway in Deep Shaft Caused by Impact Load of Roof Fracture

针对义马矿区煤层顶板巨厚砾岩层垮落引起的动载荷,通过FLAC3D数值计算,研究动载荷幅值的大小对静压巷道围岩应力场、位移场及塑性区范围的影响。模拟结果表明:随着动载荷幅值的增加,巷道顶板下沉量和煤壁位移量迅速增大,但变形速率逐渐减小,最终趋于零。随着动载峰值增大巷道围岩塑性区范围增大。

In view of the dynamic load caused by roof fracture of thick gravel strata over the coal seam in Yima mining area of China,using FLAC3 Dnumerical calculations,studied the influence of changing the dynamic load amplitude on the stress field,displacement field and plastic zones of surrounding rock in static pressure roadway. The simulation results show that the values of roof subsidence and rib displacement are increasing rapidly with the increase of amplitude of dynamic load,but the deformation rates decrease,and finally tend to zero. With the increase of load peak amplitude,the range of the plastic zone of gateway surrounding rock is increase.