Abstract: Mainly aimed at simulation and analysis of the stability of the rooms and pillars of an Open-pit mine in the process of open-pit underground combined mining.Data of in-situ measurement of ground stress and rock mechanics was analyzed in the process of project of the mine.And 2D and 3D finite element model were set up for possible conditions in the nine calculation models.The calculation results of the finite element would provide the basis foundation to the subsequent design of the mine and greater reference significance to other similar mines.

Key words: Open pit mine, Combined mining, Interaction, Ground stress, Numerical simulation