傲牛铁矿三采区充填体稳定性及间柱回采顺序研究

随着傲牛铁矿三采区矿柱的回采,矿房充填体失去矿柱的侧压限制且暴露面积越来越大,充填体的受力条件发生改变,影响其稳定性,为此需要进行充填体的稳定性及回采顺序优化研究。结合傲牛铁矿的矿岩物理力学性质和矿柱回采方法,对矿房充填体建立力学模型,分析充填体在开采时受力的稳定性,计算充填体的极限自立高度;同时根据现场情况,提出了2种间柱整体开采顺序方案和2种中段间柱回采顺序方案,并对其进行了数值计算分析。计算结果表明:在整体开采间柱顺序上,从下至上开采最优,应力集中程度低,安全性高;在265 m中段间柱开采顺序上,先开采(1)、(3)、(5)间柱,再回采(2)、(4)间柱,位移变化较小。研究成果为现场的间柱回采提供了理论依据。

Study on the Stability of Filling Body and the Rib Pillar Recovery Sequence in Three Mining Areas of Aoniu Iron Mine

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.