关键词: 数值模拟, 间柱回收, 采空区稳定性

Abstract: Fozi Mine used short-hole shrinkage method to mine，a lot of parital spacer pillars were left in the upper part of the ore-body.Fozi Mine intends to recycle the parital spacer pillar of 138 m level middle section of 104 ore body.Combined with the actual situation，this paper simulates of current mining situation，recycling the second spacer pillar and recycling half of every spacer pillar by finite difference software FLAC3D.The simulate of current mining situation shows that the spacer pillar，roof and floor stress are less than the ore rock mass strength value，it means that 138 m level middle section is stable and the parital spacer pillar can be recycled.The simulates of recycling the second spacer pillar and recycling half of every spacer pillar shows that the stress value of area have a certain growth after recycling the spacer pillar，but the the maximum principal stress and minimum principal stress increment of recycling half of every spacer pillar is less than recycling the second spacer pillar，it means that recycling half of every spacer pillar is better.The stress value of 138 m level middle section is close to the ore rock mass strength value after recycling half of every spacer pillar，we should reinforce for residual pillar.

Key words: Numerical simulation, Intervening pillar recovery, Stability of goaf