partial excavation
分部开挖
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分部开挖法 partial excavation method ; partial face excavation method
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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.
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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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