不同地质条件下的采场结构参数优化

摘要

为了确定不同地质条件下较为合理的采场结构参数,采用理论计算与数值模拟相结合的方法,对不同矿岩稳定性条件下的采场跨度进行选择与优化. 以程潮铁矿西区作为研究的工程背景,采用简支梁理论、矿房宽度计算公式对合理跨度与临界跨度进行了计算,并通过FLAC3D 数值模拟软件对不同跨度参数的采场稳定性进行了分析. 结果表明:矿岩条件为稳固、中等稳固、稳固性较差时的矿房合理跨度分别为18. 87、14. 93、8. 08 m. 多矿房回采,位移及拉应力的最大值通常出现在区域中间部位,且矿房跨度的增加极易引起开采区域最大沉降值的迅速增加. 矿柱顶板沉降值对矿房跨度也非常敏感. 数值模拟结果与理论计算值相符,这表明数值模拟能很好地反映地下开采的真实状态,为采场结构参数确定提供依据.%In order to determine the more reasonable stope structural parameters under different geological conditions, theoretical calculation and numerical simulation methods are adopted to select and optimize the stope width under different sta-bility. With the western area of Chengchao Iron Mine as engineering background, the simply supported beam theory and the stope width calculation formula are used to calculate out the reasonable span and the critical span. And the stope stability under different stope width was analyzed by FLAC3D software. The results indicated that when rock keeps stable,moderately stable or less stable,the reasonable stope width needs to be 18. 87 m,14. 93 m and 8. 08 m separately. In multi-stope mining,maximum displacement and tensile stress usually occurs in the middle of the area,and the increase of stope span can easily cause a rapid increase of maximum displacement. The subsidence of pillar roof also greatly impacted the stope span. The simulation results were consistent with the theoretical value,which indicates that the numerical simulation can well reflect the real state of under-ground mining,and provide the basis for determining stope structural parameters.