手掘浅井效率的高低,在很大程度上取决于掘凿断面的大小。在确保安全生产,达到地质采样绘图的要求下,缩小浅井断面是加速井柱掘进、提高效率、降低成本、节约原材料的关键,自59年以来,在袁家村矿区浅井施工中,曾先后试验矩形、圆形、 The efficiency of hand-drilling shallow wells depends largely on the size of the cut section. In order to ensure safety in production and meet the requirement of geological sampling and drawing, the narrowing of shallow shaft section is the key to speeding up the wellbore excavation, improving efficiency, reducing costs and saving raw materials. Since 59 years, in the shallow shaft construction of Yuanjiacun Mine, , Round,