关键词: 矿柱稳定性, 采空区处理, 数值模拟

Abstract: After years of short-hole shrinkage mining at No.104 ore-body in Fozi Mine，a lot of goafs and pillars have been left behind at the upper ore-body.Due to the disorder treatment in the early stage，goaf with complex situations was formed，which seriously threatened the safety mining of the lower ore-body.In order to produce a scientific goaf treatment measure and realize pillar recovery，the pillars stability of No.104 ore-body is analyzed combining the numerical calculation with the theoretical method，and safety factors for remained pillars at each goaf are determined.On the basis of comprehensive analysis of goaf treatment and pillar stoping，and combining with the present technology，the integral scheme of caving and backfilling was proposed.Numerical simulation on the integral scheme by software FLAC3D shows that this scheme makes upper surrounding rock at stress concentration zone fully remove and collapse，and makes goaf filled to achieve the pressure relief and rock movement controlling by pillar and roof caving.This scheme can effectively eliminate the hidden trouble of goaf，and provide a guidence for the treatment of goaf in a safe，economic and reasonable way.

Key words: Pillar stability, Goaf treatment, Numerical simulation