在地质勘探工程中,不同的矿床勘探类型相应的采用不同的勘探技术手段。如有色及稀有金属,其中特别是第三四类型的矿床勘探工作,坑道勘探是重要的技术手段之一。而采用坑道勘探,一般要求坑道的断面比较小,要求掘进的速度大,但又必须使掘进成本降到最低。在上述的矿床勘探类型中,绝大多数的矿床不论是矿石或围岩,其坚硬的程度较大。因 In the geological exploration project, different types of exploration deposits adopt different exploration techniques accordingly. In the case of colored and rare metals, especially the 34th type of deposit exploration, excavation of tunnels is one of the important technical means. The use of tunnel exploration, the general requirements of the tunnel section is relatively small, requiring tunneling speed, but must minimize the cost of driving. In the above types of deposit exploration, the vast majority of deposits, whether ore or rock, are more rigid. because