公轨共建重叠段大跨洞室群设计浅析

An Brief Analysis of the Design of Large Span Cavern Group with Road and Rail Transit Overlapped Section

曾家岩大桥北侧主线出口段各类洞室空间交错,且大跨公路隧道与轨道隧道发生重叠,其空间受力极其复杂,类似工程案例少。介绍了隧址区地质、周边环境及其相互关系等情况,分别按暗挖段、明挖段阐述了公轨重叠大跨隧道的设计关键点、结构设计、施工方案,并采用数值计算方法进行了验证。计算结果表明,公轨结构安全、变形可控。工程建设中,通过落实公轨共建理念、优化平纵面、合理确定明暗挖位置、注重施工措施等,确保大跨公轨重叠隧道的建设安全,为今后类似工程提供借鉴。

The space of all kinds of caverns in the exit section of the north main line of Zengjiayan Bridge is staggered, and the long -span highway tunnel overlaps with the track tunnel. The space force of the tunnel is extremely complex, and there are few similar project cases. The geology, surrounding environment and their relationship in the tunnel site are introduced. The key points of design, structure design and construction scheme of overlapping long-span tunnels are expounded according to the excavation section and the open-cut section respectively. The results are verified by numerical calculation method. The calculation results show that the safety and deformation of the public rail are controllable. In engineering construction, by implementing the concept of public rail co-construction, optimizing horizontal and vertical, reasonably determining the location of open and concealed excavation, and strengthened ？ construction measures, the construction safety of long-span overlapping public rail tunnels can be ensured,which can provide reference for similar projects in the future.