As a kind of new structure form, the single cavern and double layer tunnel is different from the separated tunnel and double-arch tunnel.
单洞双层隧道作为一种新的隧道形式，不同于分离式隧道和连拱式隧道。
As a kind of new structure form, the single cavern and double layer tunnel is different from the separated tunnel and double-arch tunnel.
单洞双层隧道作为一种新的隧道形式，不同于分离式隧道和连拱式隧道。
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