关键词: 矿柱回采, 极限自立高度, 充填体稳定性, 回采顺序

Abstract: With the recovery of pillars in the three mining areas of the Aoniu Iron Mine， the filling body loses the limit of the side pressure of the pillar and the exposure area becomes larger and larger. Since the force condition of the filling body is changed， its stability is affected. Therefore， it is necessary to study the stability of the filling body and optimize the stoping sequence. Based on the physical properties of ore & rock and the pillar recovery method， the mechanical model of the filling body of the room is established， the stability of the filling body under force during the mining is analyzed， and the limit self-standing height of the filling body is calculated； At the same time， according to the field situation， 2 kinds of overall rib pillar mining sequence plans and 2 kinds of rib pillar stoping sequence plans are proposed， and the related numerical calculation is carried out. The calculation results show that: the best sequence for the overall rib pillar mining is from bottom to top， with lower stress concentration and higher safety. In the mining sequence of 265 m middle rib pillar， the first， third and fifth rib pillar are recovered firstly， then the second and fourth rib pillar are mined， with less displacement. The research results provide theoretical basis for the rib pillar stoping on site.

Key words: Pillar stoping, Self-standing height limit, Stability of filling body, Mining sequence