Abstract:In order to explore the unstable areas that need special attention in the goaf, the geological stability of coal mine goaf under complex terrain in northern China is analyzed. ANSYS and FLAC3D finite element software are used to numerically analyze the geological stability of goaf under mining, freeze-thaw cycle, traffic load and building load. The numerical analysis results show that the local tensile stress occurs in the overburden above the goaf and the floor heave has serious displacement and deformation; Under the freeze-thaw cycle, the soil expands when frozen, resulting in cracks in the soil and affecting the geological stability of the goaf; Under the traffic load, the soil layer moves on a large scale, with large residual subsidence, and the goaf is prone to instability; Under the building load, the stability of the central position of the goaf is poor, which is the key area to be paid attention to in the future.