关键词: 采空区 , 充填开采, 地表沉降, 数值计算

Abstract: The surrounding rock stress changes and the surface deformation caused by underground mining affect the safety of the ground buildings. The finite element software ABAQUS was used to study the rock mass deformation and surface movement caused by backfill mining in metal mine. Based on the actual mining status and measured data of the mine，a threedimensional stratigraphic model with complex spatial structure was established. The sub-program SIGINI was used to program the ground stress，and the modified Mohr-Coulomb modelrock was adopted to simulate the rock mass. It is calculated that: due to the high mechanical strength of the surrounding rock，the roof settlement caused by the mining is relatively small，and the filling plays a certain inhibitory effect on control of the bottom drum. The reserved pillar is mainly subjected to large verti cal compressive stress. The smaller the size of the pillar is，the larger the compression is. The surface filling station is located at the edge of the goaf，with relatively low horizontal and vertical displacements. The surface deformation is mainly concen trated in the middle of the goaf. The research results can provide a basis for safe mining of resources and a reference for the se lection of ground monitoring points.

Key words: Goaf, Backfill mining, Ground settlement, Numerical calculation