改进掏槽方法提高爆破效率井巷掘进施工中，当岩性和药量不变时，爆破效率的高低主要取决于掏槽方式及相关的掏槽参数。以往，黄家坪矿接替工程平巷掘进爆破采用传统双空眼六孔菱形直线掏槽布孔方式，掏糟效率低，循环进尺少，其结果爆破材料、钻头、钎钢等材料单耗偏高，... Improved undercutting method to improve the blasting efficiency In tunneling construction, when the lithology and dose remain unchanged, the blasting efficiency depends mainly on the cutting method and the associated undercutting parameters. In the past, Huangjiaping mine tunneling blasting to replace the project using traditional double empty hole six-hole diamond straight cut hole pattern, digging low efficiency, less cycle into the ruler, the results of blasting materials, drill bits, drill steel and other material unit consumption is high, ...