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为确定马坑铁矿+100m中段顶柱留设方案,利用Flac3D软件分别模拟顶柱留设在+205m分段和+190m分段的两种留设方案。模拟结果表明:矿柱产生的走向位移比矿房顶板产生的沉降位移大;随开采工作的进行塑性区体积不断增大,矿房跨度一定时,拉伸破坏区与矿房高度呈正相关关系;当矿房高度超过60m后,拉伸破坏区不再增加,破坏形式逐渐变为矿柱剪切破坏;顶柱留设在+190m分段的方案整体稳定性好,较+205m分段更为合理,研究结果可为顶住留设提供技术支持与参考。
In order to identify the top pillar of the + 100m middle pillar in the Makeng iron mine, two schemes for leaving the top pillar in the + 205m segment and the + 190m segment were simulated respectively by Flac3D software. The simulation results show that the displacement induced by the pillars is larger than that of the roof of the mine house. The volume of the plastic zone increases with the mining work, and there is a positive correlation between the tensile failure zone and the height of the mine house when the mine span is constant. When the mine height exceeds 60m, the tensile failure zone will no longer increase, and the failure mode will gradually become the shear failure of the pillars. The overall stability of the top pillar remaining in the + 190m section is better than that of the + 205m section Reasonable, the research results can provide technical support and reference to stay.