N → another name for barrel vault
There was a revival of ancient Roman forms, including the column and round arch, the tunnel vault, and the dome.
复兴古罗马的形式，包括廊柱和圆拱，地道的拱顶以及圆屋顶。
The tunnel may parallel the street, or it may dive toward the vault.
隧道可能是与街道平行的，或者可能通到矿顶。
Therefore, the vault crown subsiding process and its total settlement are important factors for tunnel supporting design and environment controlling.
而隧道拱顶的下沉过程及其最终下沉量则是隧道支护设计及地层环境控制的重要基础。
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