关键词: 采动影响, 回采巷道, 围岩变形

Abstract: In order to explore the influence of close-distance coal seam mining on the deformation of surrounding rock of mining roadway，taking 3-805 working face of Jingfang Mine as an example，3DEC soft⁃ ware is used to comprehensively analyze the activity law of surrounding rock of coal mine roadway. In this study，3DEC software is used to construct a 260 m × 200 m × 68 m numerical model. The horizontal dis⁃ placement constraint and 6.5 MPa uniform load were set，and the coal seam is excavated step by step ( ini⁃ tial step distance 10 m，later 5 m ). The displacement，stress and roadway deformation of overlying strata are monitored by measuring lines. The results show that the immediate roof collapses with mining，the first weighting step of the main roof is 30 m ( the peak stress )，and the roof is completely compacted when ad⁃ vancing is 40 m. The evolution law is that the immediate roof collapses，the main roof masonry beam and the overlying rock sink synchronously. The stress distribution changes in stages. When advancing is 10 m，a tri⁃ angular pressure relief zone is formed in the roof and floor，and then it turns into an inverted funnel shape， with a tendency stress concentration range of about 20 m. The surrounding rock deformation of the roadway is dominated by the roof activity of the goaf，and the stress of the coal pillar changes from double peak to sin⁃ gle peak，reaching a peak of 18.27 MPa at 20 m after the working face. The deformation is characterized by roof subsidence，floor heave and asymmetric movement of the two sides. The severe deformation occurs in the stage of roof collapse and compaction after the working face is pushed over. The conclusion reveals that the roof caving and compaction activities in the goaf are the core causes of surrounding rock deformation，it is necessary to take reasonable protection measures to improve the stability of roadway surrounding rock.

Key words: mining influence, mining roadway, surrounding rock deformation