关键词: ANSYS, 有限元, 地表沉降, 地下空区

Abstract: The existing large underground mined-out area leads to the surface subsidence deformation.To predict the deformation trend，the settlement model has been established to simulate the deformation.The physical model adopts the finite element ideas，by adopting different rock layer structures，and in combination with finite element analysis software ANSYS，and the adaptive meshing algorithm for meshing grid.At the same time，the parameters evaluation weighting algorithm was used to select the physical parameters.The simulation results correspond with the actual situation，thus providing a basis for the study of surface subsidence mechanism.

Key words: ANSYS, Finite element, Subsidence deformation, Underground mined-out area