关键词: 近距离煤层, 巷道变形, 钻孔窥视, 监测分析

Abstract: In the process of underground close coal seam mining in Dafosi Coal Mine of Binchang， Shaanxi Province，the floor stress after the upper seam mining affects the stability of the lower seam road⁃ way，and the surrounding rock deformation of the roadway is serious，which has seriously affected the safe and efficient production of the lower seam mining face. In order to solve the problem of roadway stability control in close coal seam mining，the influencing factors of surrounding rock deformation in the lower coal seam roadway are analyzed by theoretical analysis，borehole peeping analysis，and on-site investigation and Study on the quality of bolt and cable support. The results show that the influence depth of the upper coal seam floor is 26.4m. The borehole peeping analysis shows that the integrity of the surrounding rock of the roof is better than that of the surrounding rock of the wall. The loose zone of the surrounding rock of the wall is within 3.3m and the coal pillar side is larger than the working face side. According to the quality in⁃ vestigation of anchor cable support，the initial anchor force of the side anchor cable is not qualified，and the construction technology is poor. By strengthening the support strength of the side，improving the anchor⁃ ing force of the anchor cable，optimizing the support parameters of the anchor mesh cable，strengthening the support in sections，and improving the drilling construction quality，the deformation of the surrounding rock of the tunnel can be controlled. The monitoring information feedback shows that the technology can completely control the deformation of the surrounding rock of the roadway，ensure that the mining roadway will not be expanded within the service period，and provide the necessary basic conditions for safe and effi⁃ cient mining of the working face.

Key words: close coal seam, roadway deformation, borehole peeping, monitoring analysis