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符山铁矿六号矿体呈水平透镜状产出,设计采用无底柱分段崩落法(下称无底柱法)回采。生产实践中,我们遇到了有关第一分段的结构参数问题,本文拟结合生产实践分析其合理的参数值。 无底柱法的结构参数:分段高度10米,进路间距8米,进路规格4×3米~2,崩矿步距1.5米。鉴于矿体顶盘岩石稳固,为给无底柱法回采创造条件,拟进行强制落顶,故对矿体顶部采用空场法回采。但在1977年结束顶部空场法回采而转入下一分段(即无底柱法第一分段)回采时,矿石损失、贫化高出意料之外。以该分段8~#采场为例,1977年
The No.6 orebody of FuShan Iron Mine is produced in a horizontal lenticular shape and is designed to be reclaimed by a subsea-free subsidence caving method (hereinafter referred to as bottomless pillar method). In production practice, we encountered the first sub-section of the structural parameters of the problem, this paper intends to combine production practices to analyze its reasonable parameter values. Bottomless column structure parameters: Section height of 10 meters, into the road spacing of 8 meters, the road specifications 4 × 3 m ~ 2, collapse mine pace 1.5 meters. In view of the ore roof rock solid, in order to create the conditions for bottomless column recovery, to be forced to fall, so the top of the ore body using empty field mining. However, when the backfilling of the top-left-field method by the end of 1977 and the switch to the next sub-section (ie, the first subsection free-pillar method) was carried out, the ore loss and depletion were unexpectedly high. Take this section 8 ~ # stope as an example, in 1977