Abstract:In order to obtain the goaf and mine stability of Qiaoqiao Phosphate Mine, a three-dimensional mechanical analysis model of goaf-pillar-mine is established by using MIDAS-GTS/NX finite element numerical simulation software, and the numerical simulation of goaf in Qiaoqiao Phosphate Mine is carried out by using non-linear static analysis method. The results show that there is no direct relationship between the shear stress of pillar and the cross section of pillar, and the shear stress of pillar is directly related to the thickness of overlying strata. The buried depth of the goaf has a great influence on the shear stress and the axial stress of the pillar in the goaf. The gravity of the upper rock mass is smaller, and the shear stress and the axial stress produced by the pillar are smaller. There is no large area of plastic zone in the mine, and the mine has good stability. The research results can provide reference for similar mines.