关键词: 阶段回采顺序, 顶板沉降, Flac^3D, 数值模拟

Abstract: With Fanshan phosphate mine as carrier，simulation on roof stress，displacement and other characteristics under different stoping sequences at two stages are carried out through Flac^3D numerical simulation software.The stress value of the stope and surrounding rocks with the stage underhand stoping is less than that with the stage overhand stoping，which is beneficial to the stability of the stope.When adopting the stage underhand mining，the filling body from the upper stage is acted as the buffering body for the deformation of the overburden rocks at this stage，by which the deformation development is fully limited and the deformation of the overburden is reduced.

Key words: Stage stoping sequence, Roof subsidence, Flac^3D, Numerical simulation