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弓长岭铁矿井下开采已有半个多世纪的 历史,早期留存有大量采空区未处理。自五 十年代以来,面对先后发生的几次大规模地 压活动,为了探索掌握其规律,矿山通过采 用监测措施,在地表和井下建立观测线(点), 根据对观测资料的分析,进行地压活动的预 报预测,及时针对险情采取对策,以保证井 下和露天安全生产。本文现将弓长岭铁矿的 有关经验和情况介绍于下,供参考。 (一)井下开采与地压活动概况 弓长岭铁矿井下开采的沉积变质型铁矿 床包括上、下两个含铁带。自上而下由第6、 5、4层矿体构成上含铁带,由第2、1层矿体 构成下含铁带。两含铁带之间有80～120米厚
Gongchangling iron mine underground mining has more than half a century of history, leaving a large number of early empty goaf untreated. Since the 1950s, in the face of several large-scale underground pressure activities that have taken place in succession, in order to explore and grasp their laws, mines establish observation lines (points) on the surface and underground by adopting monitoring measures. Based on the analysis of observed data, Ground pressure forecasting and forecasting activities, timely countermeasures against the danger to ensure safe underground and open-air production. This paper will bow Changling iron ore related experience and situation introduced below, for reference. (A) Overview of underground mining and pressure activities Sedimentary metamorphic iron ore deposits in Gongchangling iron mine include upper and lower iron-bearing belts. From top to bottom by the 6th, 5th, 4th layer ore body formed on the iron belt, the second, the first layer of ore body composition of the iron belt. Between two iron with 80 to 120 meters thick