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隧道工程的性质决定了隧道支护结构的特殊性与复杂性,特别是大断面公路隧道在穿越不良地质段落时由于开挖断面大,其初期支护结构受力更为复杂,本文以云南省在建的大断面特长公路隧道-杨林隧道为工程背景,应用复合拱理论结合现场监测对大断面公路隧道初期支护体系的承载能力进行分析并求解出锚杆、钢架与喷层各自构件的承载力及比例,通过工程实例显示喷层与钢拱架形成的内层支护拱在大断面公路隧道初期支护体系中起决定性作用;本文提出的方法可为大断面隧道初期支护的承载力分析和后续施工提供一定的借鉴和技术支护,并积累有益的经验。
The nature of the tunnel project determines the peculiarity and complexity of the tunnel support structure. Especially when the large-section highway tunnel passes through the bad geological section, the initial support structure is more stressed due to the large excavation section. In this paper, Under the background of the project, Yangling Tunnel, a large-section highway tunnel with large section under construction, is used to analyze the bearing capacity of the initial support system of large-section highway tunnel by using the composite arch theory and on-site monitoring. The bearing capacity and the ratio of the tunnels are shown. The engineering examples show that the inner support arch formed by shotcrete and steel arch plays a decisive role in the initial support system of large-section highway tunnel. The proposed method can be used for the initial support of large-section tunnel Bearing capacity analysis and follow-up construction to provide some reference and technical support, and accumulated useful experience.