基于3DMINE-MIDAS-FLAC^(3D)耦合的残矿回采稳定性研究

Study on Stability of Residual Ore Recovery Based on Coupling of 3DMINE-MIDAS/GTS-FLAC^(3D)

残矿开采条件极为复杂,回采安全性差。为了保障残采安全,利用3DMINE,MIDAS/GTS,FLAC3D软件的耦合,对残采方案的稳定性进行数值模拟研究,根据残矿开挖后所形成空区的围岩位移、应力及塑性区状态判定回采危险区。选取某矿山浅部中段残采工程为例,研究结果表明:该矿山-47 m中段部分间柱采空区的帮壁和顶板因岩移过大、拉应力过大、拉伸塑性破坏或剪切塑性破坏,出现了11处危险区;顶柱采空区顶板因拉伸塑性破坏,出现了6处危险区。通过此3种软件的耦合可精细建立复杂的数值模型,提高数值模拟结果的合理性,危险区的判定有助于指导矿山残采过程中安全监测与支护措施的实施。

Residual ore has a bad safety when recovered because of complicated mining condition.In order to ensure its safety,a numerical simulation study was carried on the stability of scheme of residual ore recovery,and a judgement on risk areas was made according to the condition of displacement,stress,and plastic areas in surrounding rock of the goaf formed by residual ore excavation,based on the coupling among softwares of 3DMINE,MIDAS/GTS and FLAC3D.Taking the residual ore recovery in shallow sections of some mine as an example,the results show that there are 11 risk areas in the walls and roofs of the goaf formed by excavation of spacer pillars,resulting from large displacement,large tensile stress,tensile or shearing plastic failure in-47 m section,and there are also 6 risk areas due to tensile plastic failure in the roofs of the goaf formed by excavation of top pillars in the section.Complex and fine numerical models can be established by the coupling among the 3 softwares,which can improve the rationality of numerical simulation,and the judgement of risk areas can contribute to the implementation of safety monitoring and support when residual ore is recovered.