无压隧洞多采用圆拱直墙形断面。
Free-flow tunnel used more round arch straight wall form cross-section.
介绍了在黄土地区双连拱隧道中墙的选择及施工过程，并分析了如何加强对中墙的监控量测等。
The paper introduced the choice and construction process of loess multi-arch tunnel middle wall, analyzed monitoring and measurement of strengthening the middle wall for reference.
四角切向燃烧和墙式对冲燃烧方式都有此问题，而W火焰双拱燃烧锅炉则更严重，值得关注。
This problem had occurred under corner tangential firing and wall opposed firing, and it became even more serious under W-shaped flame double-arch firing.
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