一、概述空场法、留矿法开采厚矿体时,矿房回采以后的密区有的可达数千米~3。为了保证回采过程的安全,通常要求矿岩稳固,而所留的矿柱尺寸也比较大。据统计,矿柱贮量可达矿块总贮量的30～60％,一般多为40～50％。因此,矿柱回采是上述采矿方法工艺中一个重要环节。 First, an overview of the empty field method, mining ore mining thick ore body, the mining area after the mining area some up to several kilometers ~ 3. In order to ensure the safety of the mining process, the ore rock is usually required to be stable, and the size of the ore pillar left is also relatively large. According to statistics, ore column reserves up to 30 to 60% of the total reserves of ore, generally more than 40 to 50%. Therefore, pillar mining is an important part of the mining process.