Stress evolution and stability analysis of surrounding rock during horizontal segmented mining of steeply inclined close-range coal seams for improved mining safety

Abstract The horizontal segmented mining of steeply inclined close Range coal seams is a complex task in coal mining. Especially in large coal seam dip angles and thick interval rock layers between coal seams, the stress distribution and stability control of surrounding rock are particularly prominent. This study proposes a horizontal segmented top coal caving mining technology based on the characteristics of steeply inclined coal seams and close Range coal seam groups in Tianshun Coal Mine, and verifies its feasibility through simulation experiments. A roadway support scheme for transportation tunnels and return air tunnels is designed based on theoretical analysis. The results showed that the displacement of the transportation roadway roof was controlled at 0.23 m, and the return airway was 0.35 m. The proposed roadway support scheme is effective, which effectively controls the surrounding rock in steeply inclined close range coal seam mining, providing a scientific basis for coal mines with similar geological conditions.