Abstract:This article takes the 113-01 fully mechanized mining face of Guotun Coal Mine as the research object, and uses a combination of numerical simulation and engineering practice to study the technology of passing through the old roadway in the mining face of deep mining mines. Based on FLAC3D numerical simulation analysis, it was found that when the untreated old roadway was pushed to a distance of 10 meters from the working face, the peak stress of the coal pillar reached 131.2MPa, and the plastic zone extended to 16 meters, resulting in a significant risk of roof collapse; After using EW-1 inorganic filling material with a water cement ratio of 6∶1 to fill the old roadway, the expansion range of the plastic zone is significantly reduced, and the stability of the surrounding rock is significantly improved. Combining roof grouting reinforcement with quality control measures for mining engineering, on-site practice has shown that the roof of the working face is intact during the passage of the old roadway, and no roof collapse accidents have occurred. The support resistance is stable, which verifies the effectiveness of the passage of the old roadway technology. This study provides technical reference for the safe passage of old tunnels in deep mine working faces.
