Abstract: During the excavation of tunnels in geological structure affected areas, it is common to face problems such as rock fragmentation and structural stress development. During the excavation of tunnels, problems such as roof fall, wall fragmentation, and large deformation of the surrounding rock are prone to occur, which are key issues that need to be addressed during coal production in the mine. Taking the S204 return air passage through the F34 fault as the engineering background, in order to effectively control the deformation of the surrounding rock of the tunnel, numerical simulation research was used to analyze the deformation of the surrounding rock under the original support measures of the S204 return air passage. It was found that the existing support measures could not meet the requirements of support strength. After 30 days of support completion, the left side of the excavation section collapsed as a whole, the right side deformed severely, and the bottom plate bulged. Based on the on-site situation, advanced grouting was carried out in the F34 fault area, combined with U-shaped steel reinforcement support. The reinforcement support measures were investigated using a roof separation device. According to the observation results, advanced grouting in the fault area combined with U-shaped steel support effectively controlled the instability of the S204 return air passage through the F34 fault surrounding rock, with a maximum displacement of 30 mm and stable surrounding rock.