研究表明，推进力和稳定比N是影响老隧道变形的主要因素。
The research result shows that advance force and stability ratio N are the main factors controlling …
有些老混凝土工程或新建混凝土工程出现施工缺陷，客观条件下不允许按常规方法修补，如公路路面、桥梁、隧道等。
It is not allowed to repair by normal ways when construction defects happened to some old concrete engineering or new-built ones, eg pavement, bridge, tunnel, etc.
经综合分析认为型钢拱架及格栅拱架均能适用于IV级黏质老黄土隧道，但格栅拱架更具优越性。
It is shown by the analysis that the steel grid and section steel are both applicable to the tunnel in the viscous old accumulation loess of degree IV, but steel grid is more advantageous.
经综合分析认为型钢拱架及格栅拱架均能适用于IV级黏质老黄土隧道，但格栅拱架更具优越性。
It is shown by the analysis that the steel grid and section steel are both applicable to the tunnel in the viscous old accumulation loess of degree IV, but steel grid is more advantageous.
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