Abstract: The underground mining of Shujigou Iron Mine led to the surface subsidence and collapse. And the subsidence pits can potentially spread to surrounding villages. In the design the engineering analogy method was used to determine the rock displacement angle. Based on the on-site survey, the numerical simulation software was adopted to make a simulation analysis research on the underground mining of the mine, and it finally get the strata displacement angle: when the upper plate of amphibolite at 62.5°, the lower plate at 62° with the strike of 65°, the movement angle is determined to be 45° at Tertiary and Quaternary System.

Key words: Displacement angle, Strata movement, Surface subsidence, Numerical simulation