北衙露天转地下开采隔离矿柱的稳定性分析

Stability analysis on slope of open pit for transition from open pit to underground mining

露采边坡和隔离矿柱稳定性分析是露天转地下矿山经常面临的问题,对于金属矿山地下开采安全生产极其重要。根据北衙金矿矿段隔离矿柱的厚度以及边坡工程地质条件,采用有限差分法数值软件对露采转地下的隔离矿柱进行了不同厚度的模拟计算。结果表明,露采边坡在地下开采期间隔离矿柱设为50m较为可靠,边坡基本处于稳定状态,为该矿体安全高效回采提供了理论依据和技术指导。

The stability of isolated pillar,which can be found across in mine shifting from open pit to underground mining,is very important for safe production of underground mine.According to thickness condition of isolated pillar and the geological conditions of slope project in Beiya Iron Mine,the FDM program is adopted to simulate the ore body recovery.The result shows that slope of open pit is stable during underground mining,and the rationality of the thickness of isolated pillar is verified.Meanwhile it can provide technical support to the safe and effective mining for this mine.