为解决明挖隧道结构形式单一（多采用矩形结构）、方案研究偏少、断面形式创新不足的问题，以塞尔维亚Sirine隧道为例，引入2种国外采用的异形断面，并与传统折板拱、矩形断面进行受力特性和经济性等对比分析。研究结果表明： 1）“平底+圆拱”断面方案的拱形部分受力特性良好，通行视觉效果好，但底板受力较差，经济性较差； 2）组合断面方案经济性最优，各构件受力明确，但结构的防水效果和整体性较差； 3）折板拱断面与矩形断面类似，两者虽然受力特性一般，经济性一般，但具有基坑规模小、空间利用率高、防水效果好、施工简单等优点。经对比，引入的国外新型断面相比传统断面虽然并不具有绝对优势，但可为明挖隧道断面形式选择提供参考，并为断面方案创新提供借鉴。
The opencut tunnel structure has many
problems such as single structure form (mostly rectangular structure), few
scheme studies, and insufficient innovation in crosssection
form. As a result, a case study is conducted on the Sirine tunnel in Serbia,
and two kinds of specialshaped crosssections out of China are selected to conduct comparison with
traditional folded plate arch and rectangular crosssection
in terms of mechanical characteristics and economy. The results reveal the
following: (1) The arch part of the "flat bottom + round arch" crosssection scheme has good stress characteristics and visual effect,
but the bottom plate has poor stress conditions and economic benefit. (2) The
combination crosssection scheme has the best economic
benefit and the force of each component is clear, but the waterproof effect and
integrity of the structure are poor. (3) The crosssection
of folded plate arch is similar to that of rectangular crosssection. Although the two have general mechanical characteristics
and economic benefit, they have the advantages of small foundation pit scale,
high utilization rate of space, good waterproof effect, and simple
construction. The specialshaped crosssections in case study can provide reference for the selection and
optimization of the crosssection form of opencut tunnel.
