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在世界范围内,由于高速运输干线的规模不断扩大,各种技术和隧道施工工艺的迅速提高,山岭隧道工程结构的修建规模是前所未有的。一、隧道有向长大化发展的趋势山岭隧道的长大,是因为线路遇到大山。过去人们往往使线路展线,尽量缩短隧道长度或不修隧道,而现在则有隧道长大化的趋势,这在某种程度上说明隧道施工技术的发展。如
In the world, due to the continuous expansion of high-speed trunk lines and the rapid increase of various technologies and tunnel construction techniques, the construction scale of mountain tunnel construction is unprecedented. First, the trend of the tunnel has grown up The growth of the mountain tunnel, because the line encountered mountains. In the past, people often used lines to extend their lines to shorten the length of tunnels or repair tunnels. Now tunnels tend to grow. This shows to some extent the development of tunnel construction techniques. Such as