最后，对无中墙连拱隧道的施工方案进行了比选，即对交叉中隔壁工法的两种施工工序进行比较分析。
Finally, the construction plans of the double-arch tunnel without middle-wall are compared, that is, two construction process engineering methods of CRD construction method are compared.
综合研究各种可能的施工方案，进行细致的比选十分必要。
The comprehensive research on various construction schemes and the detailed comparison and selection are quite necessary.
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