... staged diffusion technique 多重扩散妙技 stage working area x y 平板工坐 stage of amplification 放年夜级 ...
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stage working area x y 平板工坐
Larger tunnel section brings larger exposed area and higher risks when shield departs from the working shaft, so the stability of reinforced soil in this stage is the new challenge for the work.
隧道断面越大，封门拆除时加固土体所暴露的面积也越大，施工风险也就越高。
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