Abstract: Based on the survey and the classification of the subsidence area of Beiminghe iron mine, a model is created via the numerical simulation software. Because of the requirement of continuity in the numerical simulation software, the plastic distortion of the upper surrounding wall instead of the collapse in the top of mined-out area will be obtained, which is inconsistent with the actual situation. The goaf could be substituted with the collapsing body, so a related numerical model can be created, and then the prediction on the subsidence area can be obtained via the numerical simulation and calculation. Based on this, the treatment measures are proposed, providing a certain reference for the treatment of the subsidence area in typical caving mining.

Key words: Numerical simulation, Collapsing body, Subsidence area, Prediction and treatment