Deformation Law and Control Technology of Floor Roadway under Multiple Mining Conditions

Abstract

In this study, FLAC3D software was used to establish a numerical simulation model to investigate the deformation characteristics of surrounding rock in the floor roadway of a gangue belt conveyor at a mining area in Gubei Mine. The stress evolution and plastic zone expansion of the surrounding rock under multiple mining-induced disturbances were explored, and an optimized roadway support scheme was proposed. The constant parameters specified before solving the model included the mining layout, geological conditions, material properties, and loading conditions. The stress evolution and plastic zone characteristics were determined through simulation. The stress concentration zone exhibited a "butterfly" shape during mining and disappeared after pressure relief upon mining completion. The plastic zone expansion pattern showed consistency with the stress evolution characteristics, with rapid expansion observed when the distance between the adjacent coal seam working face and the roadway was less than 80 m. Based on the results, an “advanced reinforcement” anchor bolt and cable support scheme was developed, and field experiments demonstrated a significant reduction in roadway deformation. These findings provide practical guidance for roadway surrounding rock control under similar conditions.