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罗汉山隧道是福建省福州长乐国际机场高速公路二期工程中的一座双向八车道(2×4车道)双连拱隧道,开挖跨径宽达41.6 m(连拱开挖总宽度),是我国目前跨径最大的双连拱隧道。隧道进口位于地形严重偏压地段,为贯彻“‘零’开挖”理念,并确保施工安全,避免洞口“大挖大刷”形成高边坡、仰坡,隧道进口段采用“半明半暗”的双连拱隧道进洞方法。文章从设计的角度,对隧道不同的进洞方案进行分析、比较,并重点叙述了特大跨径“半明半暗”双连拱隧道的设计与计算。
Lohan Hill Tunnel is a two-way eight-lane (2 × 4 lane) double-arch tunnel in the second phase of the Fuzhou Changle International Airport Expressway. The tunnel has a span of 41.6 m (total width of multiple arch excavations) and is At present, China’s largest span double-arch tunnel. The entrance to the tunnel is located at a serious bias location in the terrain. In order to carry out the concept of “zero excavation” and ensure construction safety, avoid the entrance of “large digging brush” to form high slope, “Half-dark” double-arch tunnel hole method. From the perspective of design, this paper analyzes and compares different tunneling schemes of tunnels, and emphatically describes the design and calculation of extra-large span semi-dark tunnels.