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目前正处于发展地下工程有利的经济环境中,许多地方都需要修建隧道,有的修建在水下困难的土层中,有的修在有水或无水的不良岩层中,或者隧道要通过挤压地层。在非常坚硬的岩石中隧道施工技术也取得了进展,传统的钻爆方法同钻机与爆破法相结合的方法之间展开了造价和进度上的竞争,从而建成了造价低、非圆形的铁路,公路隧道。
It is currently in a favorable economic environment for the development of underground engineering. Tunnels need to be constructed in many places. Some are built in subsoiled soil, some in poor rock formations with water or water, or in tunnels. Press the formation. Progress has also been made in the construction of tunnels in very hard rock. Costs and schedule competition between the traditional method of drilling and blasting and the method of combining drilling and blasting have resulted in the construction of low-cost, non-circular railways, Road tunnel.