金源矿区深部开采模拟及稳定性分析

Simulation and Stability Analysis of Deep Mining in Jinyuan Mine

灵宝金源矿区已进入深部开采,采场稳定性对矿区的安全开采的影响极大。使用FLAC^(3D)软件,对该矿区进行了深部开采的数值模拟,其模拟结果表明:矿区最大主应力主要集中于各开采阶段工作面顶部和底部围岩,两帮围岩也出现不同程度的应力集中现象;随着阶段开采向上推进,该矿区拉应力极值较小且基本保持不变,一般不会出现围压的拉伸破坏;中段开采的各阶段,底板均有不同程度的些许微弱底鼓现象。开采过程中应对顶板进行加固支护并密切监测其变化,由于出现了部分破碎围岩,可设立人工矿柱支撑,此外,可采取例如减小采场宽度的方法以增加采场稳定性,减少岩爆事故的发生。

Lingbao Jinyuan mining area has entered deep mining stage, thus stope stability has a great influence on the safety ot mining. FLAC3D software was used for numerical simulation of deep mining in this mine area. Simulation results indicated that the biggest principal stress in the mine areawas mainly distributed on the surrounding rocks at the top and bottom, and the surrounding rocks in two sides also had the phenomenon of rock stress concentration. As the mining work was pushed upward, the tensile stress extremum in this mining area was small and changed little, and the tensile failure of confining pressure would not appear generally. In all the mining stages of middle sections, the bottom plates all had different degrees of weak floor heave to different extents. The roof reinforcement and closely monitor of the change should be carried out during the mining process. Due to the emergence of partial breakage in surrounding rocks, artificial pillar support would be installed. Some other measures can be taken such as narrowing the width of stope to enhance the stope stability and to eliminate the occurrence of rock burst accidents.