Abstract: The west part of Chengchao Iron Mine is metal mine characterized by steep structure plane. In this study, the monitored data of the ground deformation and macroscopic damage features of the mining area are analyzed. The strata movement in mining area can divided into two stages. The first stage is that the failure of the roof rock masses extends to the ground surface and then cause subsidence, while the second stage is that surrounding rock mass around goaf topples to mined-out area. Through the investigation of toppling-sliding area, it is found that the horizontal displacement mainly occurs in this area, which is greater than the vertical displacement; the ground deformation firstly increases slowly, then enters a rapid deformation phase, there exists a significant turning point; the superimposition stress induced by mining subsidence and terrain characteristics increases the ground deformation in the downhill areas, especially the horizontal displacement. Meanwhile, the distribution characteristics of angle of ground movement are revealed in the mine. The angle of ground movement in the south part of mine is greater than that in the north part, and the reason is that the north part is affected by the NNW, NNE structure planes, where the toppling failure is quite serious. The research results may be applied to the similar metal mines.

Key words: mining engineering, underground mining, ground movement, ground deformation