在地下采掘工作中,天井掘进仍属安全性较差的作业之一。在向山硫铁矿,多年来虽在低中段中成功地采用吊罐法掘进天井,可是对于新的较高的中段,特别是在松软且含水的矿岩中掘进天井,这就有必要试验采用更安全的新掘进法。 In underground excavation work, tunneling is still one of the less secure operations. In the Xiangshan sapphire, the successful use of the hanging jar method for tunneling in the low and middle stages over the years has led to the need for experimental use of new pavements for the new upper middle section, particularly in loose and hydrous ores Safer new driving method.