我国地下铁矿山矿床一般埋藏较深,贮量十分可观,采用露天开采需要剥离大量的土石方工程,基建投资大,施工周期长,既不经济,又不合理。为了使我国的矿山事业迅速地向前发展,供应冶金工业充足的原料,对大型地下矿山,采矿工业采用了中孔及深孔崩落等高效率的采矿方法,大块粒度达到600～800 mm,其 China’s underground iron ore deposits are generally buried deep, the reserves are considerable, the use of open pit mining need to divest a large number of earth and rock works, infrastructure investment, long construction period, neither economical nor unreasonable. In order to make the mining industry in our country move forward rapidly and supply sufficient raw materials for the metallurgical industry, we have adopted high-efficiency mining methods such as mesopore and deep-hole caving for large-scale underground mines and mining industries with large grain sizes of 600-800 mm, its