Abstract:
To address the design challenges 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. The study determines an optimal external offset and proposes a corresponding roadway support scheme based on the actual working condition of 404 mining area in Xiagou Mine. The roadway layout and support mode are verified via numerical simulation and field measurement. Results show that under the influence of strong disturbance from the upper layer, the roadway layout for bottom coal recovery should adopt an external staggered layout, with a reasonable external staggered distance of 6 m. At this distance, the stress fluctuation of the surrounding rock, the non-uniformity of stress distribution, and the deformation uniformity of roadway under disturbance meet production requirements. Ihe findings confirm that a 6-meter layout combined with the proposed roadway supporting method is reasonable, providing valuable references for roadway arrangement and support under similar engineering conditions.