Abstract:
In order to solve the design problem of roadway layout and support mode for recovery of bottom coal left by strong disturbance in Xiagou Mine, this paper studies the reasonable staggered distance of roadway layout after upper slicing mining and the stress distribution law of roadway under different staggered distances by theoretical analysis and numerical simulation. Finally, the reasonable external offset is determined. Based on the actual working condition of 404 mining area in Xiagou Mine, the corresponding roadway support scheme is proposed. Finally, the roadway layout and support mode are verified by numerical simulation and field measurement. The results show that under the influence of strong disturbance in the upper layer, the roadway layout of bottom coal recovery should adopt the external staggered layout and the reasonable external staggered distance is 6 m. At this time, The stress fluctuation of surrounding rock, the non-uniformity of stress distribution and the deformation uniformity of roadway under the influence of disturbance meet the production needs. It shows that 6m layout and roadway supporting method are more reasonable, which has reference significance for roadway arrangement and support under similar engineering conditions.