This study is to further explore the influence of repeated mining on surface changes in coal mining areas, and discuss the law of surface movement under special surface conditions. Based on the observation technology of surface movement and the numerical simulation method of universal discrete element code (UDEC), it analyzes the surface movement of mining surfaces 204 and 205 in the panel 2 area of Tingnan Coal Mine in Binchang mining area under repeated mining. The research results show that the 204 working area is extremely inadequately mined, so the surface movement is very small, the subsidence rate is only 0.046, and the surface deformation is weak, which will not cause damage to the surface construction facilities. The mining results in the 205 working area, which is close to the conventional full mining conditions, show that the surface movement is serious with obvious deformation, and the subsidence rate reaches 0.22, which is far from the maximum subsidence value, and the insufficient mining subsidence range shows basically same with that of the sufficient mining. Simultaneously, the surface movement law of multi-face mining is simulated based on the UDEC numerical simulation method. The results reveal that the mining surface movement law of 204 and 205 working faces is basically consistent with the surface observation results. The content of this study can provide scientific and effective reference materials for subsequent research on surface movement monitoring, and is of great significance to the safe mining of coal under buildings (structures) in Binchang mining area.
