Brushing Safety and Supporting System for Coal Roadway with High Dynamic Pressure and Stress

Based on the engineering practice in Fucun Coal Mine, we carry out optimization design for the supporting scheme in 3 upper 402 mining area brushing area by large deformation numerical simulation. The result shows that the comprehensive scheme of pre-stressed anchor/bolt can inhibit the roof deformation, increase the stability of surrounding rock and ensure project safety. On the base of original tunnel supporting system, if some anchor reinforcement is added on the top of the tunnel, the displacement caused by the brushing can be decreased 3 cm, at the same time, the plastic zone located in the coal layer is only about 5 m caused by the brushing than former design. The monitoring data meet the numerical results well after the proposed supporting design was applied in the real project.