济南地铁大跨无柱拱形结构 内力分析及施工技术

以济南地铁龙奥站为依托，研究硬岩地层大跨无柱拱形地铁车站结构受力特性及施工技术，进行二维有 限差分数值计算，结果表明：基坑施工引起的支护结构水平位移及内力均较小，采用多级放坡开挖和喷锚支护的 方式可保证基坑安全施工；无柱拱形结构顶板弯矩、轴力值均较大，同时中板表现为偏心受拉状态，是主体结构 中的薄弱环节，但仍具有较大的安全系数，结构整体安全可靠。大跨无柱拱形车站施工技术已在济南地铁龙奥站 取得成功应用，可为类似工程提供借鉴。

Internal Force and Construction Technology of Long-span Columnless Arch Structure of Jinan Metro

A columnless subway station has the characteristics of wide spatial vision, high passenger flow efficiency, and beautiful appearance. It has been successfully applied in many cities. To study the mechanical characteristics and construction technology of a long-span columnless arch subway station in a hard rock stratum, based on the Longao station of the Jinan subway, a two-dimensional finite difference numerical calculation was performed. The following results were obtained: 1) the horizontal displacement and internal force of the supporting structure caused by the construction of the foundation pit were small and the safe construction of the foundation pit can be ensured by multi-stage slope excavation and shotcrete anchor support. 2) The bending moment and axial force of the top plate of the columnless arch structure were large, and the middle plate was eccentrically tensioned, making it a weak link in the main structure; however, it still had a large safety factor, and the whole structure was safe and reliable. The construction technology for the long-span columnless arch station has been successfully applied in the Longao station of Jinan Metro, and it can be useful for similar projects.