基于FLAC对露天转井下开采的采场稳定性影响模拟研究

Simulation Study on Stope Stability Influence of Open Pit Mining to Underground based on FLAC

以某矿露天转井下开采系统为研究对象,根据现场实测工程地质力学数据和露天转井下开采方案,运用FLAC模拟分析露天边坡和井下采场周围介质应力场、位移场和塑性区的开采变动分布,研究露天和井下采场结构介质应力应变规律、几何变形特征和结构承载性能受露天转井下开采扰动的影响。结果表明:采场结构介质整体稳定性好、安全,露天边坡中部、露天转井下开采过渡保安层、井下采场中部两帮围岩和充填介质接触带为局部不稳定部位,应加强监控和支护。

Took the open pit to underground mining system of a mine as the research target,based on sites measured engineering geomechanics data and open pit to underground mining scheme,mining change distribution of open pit slope,stress field,displacement field and plastic zone of underground stope surrounding media were simulated analyzed by using FLAC,the influence of stress—strain laws,geometric deformation characteristics and structure bearing behavior of open pit and underground stope structure medium by open-pit to underground mining were studied.The results indicated,whole stability of stope structure medium was good and safe,middle of open pit slope,open pit to underground mining transition security layer,two sides surrounding rock of underground stope middle and filling medium contact zone were partial unstable location,should enhanced monitoring and support.