在掘进坑道当中,提高掘效率,当然为第一重要问题,但坑道的要素不适当时,就不得谓为质量双全的坑道。我们在坑道的数量上,对于“如何以最小的火药量,获得最大的进度,如何使全月的进度提高”等问题,因曾锐意研究,现在各矿的进度,已日渐向上,获有显著的成绩,然而对坑道的质量,即“规定的断面,方向,坡度”仍旧态依然,改过的地方不多,其结果致增加 Among the excavation tunnels, it is of course the first important issue to improve digging efficiency. However, when the elements of the tunnel are not appropriate, they can not be regarded as tunnels of double quality. As for the number of tunnels, we have done some research on the issue of “how to get the maximum progress with the smallest amount of gunpowder and how to make the progress of the whole month.” As the progress of various mines has been gradually increasing, However, the quality of the tunnel, that is, the “prescribed section, direction and slope” remained unchanged and the number of rehabilitated areas was still small. As a result, the quality of the tunnel was increased