Abstract: Induced caving is a new underground mining method， which contributes to the smooth connection of ore production during the transition from open pit to underground. However， large scale of slope failure can be triggered when mining hanging-wall ores by this method， which would pose a threat to the open-pit mining， the open-pit transportation system and the surface infrastructure. The discontinuous geological structure of the rock mass is a key factor for slope stability. In this paper， the discontinuous deformation analysis(DDA)was used to study the slope failure process caused by hanging-wall-ore mining excavated by the induced caving method in different rock mass structures. Three slope failure modes， namely， sliding， toppling and complex failures， were concluded based on seven models with different rock mass structures， leading to different failure modes. A case of slope failure was analyzed based on Hainan iron mine. This study provides some technical supports for mining design of induced caving， as well as risk prediction and prevention of slope failure.

Key words: hanging-wall ore, induced caving method, slope failure, rock mass structure, DDA