关键词: 空巷, 围岩变形, 高水材料, 充填参数

Abstract: The existing empty roadways within the working face significantly increase the technical dif⁃ ficulty of coal mining. Based on the geological data of the 5206 working face of Kaichuan Coal Mine，a nu⁃ merical calculation model is established using FLAC3D to analyze the stress distribution and deformation law of the surrounding rock of the empty roadway along with the mining movement of the working face. The stabil⁃ ity of the roof structure passing through the empty roadway in the working face is studied through theoretical analysis. The results show that the advanced stress concentration always occurs within 10~20 m in front of the coal wall of the working face. When the working face is 10 m away from the empty roadway，the impact of the mining movement of the working face on the surrounding rock of the empty roadway increases rapidly. From this time until the working face is fully connected，it will cause the manifestation of strong mine pres⁃ sure in the working face. The mining movement of the working face has the least impact on the bottom drum of the empty roadway and the greatest impact on the subsidence of the roof. The two sides of the empty road⁃ way show asymmetric failure，which is manifested as the approach of the working face side of the empty road⁃ way being much greater than that of the solid coal side. After calculation，the minimum support strength of the filling body required for the stability of the surrounding rock in the empty roadway is 1.24 MPa. Com⁃ bined with the laboratory test results，it is determined that the water-cement ratio of the high-water material filling is 4∶1. The on-site monitoring results showed that no abnormal pressure is observed on the support during the period when the working face passed through the empty roadway，and the filling body could effec⁃ tively support the roof to ensure the smooth mining of the working face.

Key words: empty roadways, surrounding rock deformation, high-water material, filling parameters