与铁路隧道相比，公路隧道跨度大，扁平率低，开挖多采用分部法。
Compared with railway tunnels, the span of highway tunnels is large and their flat ratio is low.
隧道不同开挖分部纵向间距应大于一倍的开挖影响半径。
The longitudinal distance of different excavation steps should be larger than the influence radius of excavation.
隧道不同开挖分部纵向间距应大于一倍的开挖影响半径。
The longitudinal distance of different excavation steps should be larger than the influence radius of excavation.
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