To address the challenge of optimizing floor roadway layout for gas drainage under multi-mining disturbances, this study integrates theoretical analysis, numerical simulation, and field validation, using the 29th mining area of Zhangcun Coal Mine as the engineering background. Based on limit equilibrium theory and slip line field analysis, the maximum floor failure depth was calculated to be 9.6 m. FLAC3D simulations were then employed to invert the evolution of the floor stress field following the mining of the 2901 working face, revealing that the horizontal spacing of the floor roadway should not be less than 50 m. Subsequently, different vertical spacing schemes were simulated to evaluate the multi-disturbance effects induced by the sequential mining of the 2901 and 2902 working faces, with a focus on vertical stress responses. Among the three vertical spacing schemes considered, the 10 m option exhibited the best overall performance in terms of peak stress control and stress variation stability. Field industrial trials further confirmed that floor roadways arranged with a horizontal spacing of 50 m and a vertical spacing of 10 m, supported by a combined bolt-cable system, achieved roof separation below 12 mm and sidewall displacement below 6 mm. The resulting stable surrounding rock deformation meets the requirements for safe and efficient production. Overall, this research provides both a theoretical basis and a generalizable engineering paradigm for the precise layout of floor roadways under similar geological conditions.
Fan et al. (Mon,) studied this question.