城市核心区地下道路立交大跨分岔隧道结构与选型

Structure Selection and Design of Large-Span Bifurcated Tunnel for Underground Road Interchange in the Core Area of City

城市核心区的地下道路立交工程为地下道路的关键节点,其出入口分岔大跨隧道的设计施工为地下道路建设关键技术之一。以重庆两江桥渝中隧道地下立交工程及类似工程为背景,结合大量工程实践,针对城市核心区域的地下立交出入口处大跨分岔隧道特点,分别提出暗挖施工法隧道及明挖施工法隧道大跨度判别标准;针对位于城市核心区域的大跨分岔隧道结构,从结构断面型式、结构体系及建筑材料等方面研究论述了结构选型和设计,以达到"安全、经济、适用"的目的。本研究依托工程已基本完工,研究结论及工程方案可供类似工程借鉴。

Underground road interchange in urban core area is the key node of underground roads, and the design and construction of large span tunnel with bifurcated entrance and exit is one of the key technologies of underground road construction. Taking Yuzhong tunnel underground interchange of Chongqing two-river-Bridge Project and similar projects as background, combined with a number of engineering cases,according to the characteristics of large-span bifurcation tunnel, the criteria for distinguishing the long-span of tunnel with the method of ？ concealed excavation construction and the method of cutting and covering construction are proposed respectively. In order to achieve the goal of safety, economy and applicability, the structure type selection and design of cross-bifurcation tunnel are discussed from the aspects of structure section type, structure system and building materials. The project is basically completed and the research conclusion and project plan can be referenced for similar projects.