采用单体液压支柱、金属摩擦支柱的普通回采工作面,近年来配备了切顶支柱,收到了显著的经济效益。根据国外使用的经验,采用切顶支柱实现机械化放顶,工作面产量可提高到50％以上,我国国内试验表明可提高产量三分之一至二分之一。此外,采用切顶支柱的工作面,由于顶板压力由切顶支柱承担其大部分,因而支柱密度可以下降,坑木消耗和支护工作人员相应减少。采用切顶支柱后矿井的安全情况也有明显的改 Using single hydraulic props, metal friction prop ordinary mining face, in recent years with a cut top pillar, has received significant economic benefits. According to the experience of foreign countries, using top cut pillars to mechanize caving, the working face output can be increased to over 50%. Our domestic tests show that the output can be increased by one third to one half. In addition, the working face using the top-cut pillars can reduce the pillar density and reduce the consumption of pit pits and the support staff due to the pressure of the roof being mostly occupied by the cut-top pillars. The safety situation of mines after using top cut pillars also has obvious changes