Abstract: Based on the condition of mining tunnel of steep coal seam fully-mechanized face in a coal mine in Sichuan province, combined with observation results of pillars' support resistance in tunnel and deformation of tunnel, deformation features of mining tunnel in steep coal seam were analyzed. The related results indicate that the surrounding rock mass deformation of return airflow tunnel is larger than haulage drift. Meanwhile, surrounding rock mass deformation increases with the distance to working face decreases.

Key words: Steep coal seam, Fully-mechanized face, Tunnel deformation, Surrounding rock mass deformation