【摘要】 针对庙冲铁矿露天转地下开采2年过渡期的生产需求，开展产能接续分析与开采顺序及稳定性研究。通过矿体储量估算，确定过渡期首采方案为370 m中段南端的盘区（1）和盘区（2）,利用FLAC^3D软件构建包含矿体、岩层、露天采坑及地下巷道的模型，分析过渡期露天采坑与370 m中段巷道的位移、应力及塑性区分布特征。结果表明，过渡期370 m中段盘区（1）和盘区（2）的矿量可满足产能需求且留有备采矿量；露天采坑及370 m中段巷道的整体位移均小于5 mm,应力分布以压应力为主，且远低于岩体抗压能力，未出现大范围贯通塑性区，稳定性良好，开采扰动影响较小。实际生产中，建议采用分段微差爆破技术，实行露天与地下错开爆破作业模式；同时加强露天边坡及井下巷道的安全监测，确保矿山露天转地下开采过渡期安全生产。更多还原

【Abstract】 To meet the requirements during a 2-year transition period from open-pit to underground mining in Miaochong Iron Mine, its productivity continuity and mining stability were analyzed. Based on ore reserve estimation, Panel（1） and Panel（2） at the southern end of the roadway at midsection（370 m） of ore body are decided to be an initial mining plan for the transition period. Then, a model including ore bodies, rock formation, open-pit mine and underground roadways is built with FLAC^3D software, which is then adopted to analyze the displacement, stress and plastic zone distribution characteristics of the open-pit and roadways at the midsection（370 m） during the transition period. The results show that the ore quantities in Panel（1） and Panel（2） at the midsection（370 m） during the transition period can ensure production capacity requirement, but also is sufficient for subsequent mining. It is found that the overall displacement of the open-pit and roadways at the midsection（370 m） is less than 5 mm, and compressive stress becomes dominant in the stress distribution, which is far lower than the stress resistance of the rock mass. There is no large-scale continuous plastic zone, indicating good stability and small impact by mining disturbance. In practical production, it is recommended that a segmented millisecond blasting should be adopted to achieve a staggered blasting operation between open-pit and underground mine. Besides, efforts should be intensified in monitoring open-pit slope and underground roadways to ensure safe production during the transition from open-pit to underground mining.更多还原