When we cannot solve the problems above with separate double tunnels,multiple-arch tunnels and small interval tunnel appear.
在分离式双洞隧道难以解决上述问题时,出现了连拱隧道及小净距隧道等特殊结构型式。
参考来源 - 小净距隧道合理净距及其施工方法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
小净距隧道的中间夹岩处于复杂的三维受力状态。
Sandwiched rock between twin closely spaced tunnels is in complicated and three-dimensional stress state.
小净距隧道的爆破施工不可避免地造成围岩累计损伤，岩体力学性能劣化。
The blasting construction of small clear distance tunnel inevitably causes accumulative damage of surrounding rocks and its mechanical behaviors will be degenerated.
在现行的隧道设计施工规范中，还没有明确规定小净距隧道的设计、施工规程。
Up to now there are no explicit specifications in our country for the design and construction of twin tunnels with small spacing.
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