Abstract: A technical scheme of mining multi-mined-out areas layered orebody based on induced caving method(ICM) was proposed， and 3DEC software was used to study the mechanism and law of induced caving. Four different withdrawal sequences were designed and simulated by the 3DEC software. The results showed that the larger the number of mined-out areas around the pillar and the smaller the size of the pillar， the more easily the cracks form in the pillar due to stress concentration. Once the crack connected with the bedding plane， the falling of the orebody begins. If the undercutting project is arranged at the bottom of the most vulnerable pillar and the undercutting area is continuously expanded from the pillar to the surrounding area， the continuous caving of orebody can occur in the shortest time. In this way， the safe and efficient mining of multi-mined-out orebody can be realized.

Key words: multi-mined-out orebody, induced caving, undercut scheme, mined-out area groups, 3DEC simulation