无底柱崩落法突出的问题是贫化损失率高,目前,我国矿山的损失率一般都在25～30％,个别矿山高达40～50％,贫化率20％以上,高达30～40％。北京钢铁学院矿业研究所采用分段进路放矿崩落留矿法新方案与普通无底柱崩落法进行试验室对比研究,获得了初步成效。实验模型采用的矿块下盘倾角80°,水平厚度60m,分段高度10m,进路间距10m。 At present, the loss rate of mines in our country is generally 25-30%, as high as 40-50% in individual mines, and the depletion rate is over 20%, up to 30-40% . Beijing Institute of Iron and Steel Mining Institute adopted the sub-approach caving ore loosening and retention of a new program and common non-pillar caving method laboratory comparative study, and achieved initial results. The experimental model adopted the inclination angle of the bottom block of the ore block 80 °, the horizontal thickness of 60m, the segment height of 10m and the distance of the approach of 10m.