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大断面公路隧道其扁平化的衬砌结构使衬砌受力趋于不利。本文以重庆双碑隧道为依托,展开现场测试和数值模拟,研究大断面隧道二次衬砌的受力特性,得出以下结论:二次衬砌轴力随施做时间逐步增大,且下半断面受力明显高于上半断面;二衬弯矩分为正弯区以及负弯区,拱腰、拱墙、拱脚承受负弯矩,拱顶、拱肩及仰拱承受正弯矩;双洞隧道受相邻隧洞近接施工的影响,表现出一定的偏压效果,衬砌近接施工一侧作用力较小;拱脚为衬砌结构受力的最不利位置。
The flat lining structure of large-section highway tunnel tends to stress the lining. Based on the Chongqing Double-Beam Tunnel, the field test and numerical simulation are carried out to study the stress characteristics of the secondary lining of the large-section tunnel. The following conclusions are drawn: The axial force of the secondary lining gradually increases with the application time, and the lower half section The bending moment of the second lining is divided into the positive bending zone and the negative bending zone, the arch waist, the arch wall and the arch foot bear the negative bending moment, the vault, the arch shoulder and the inverted arch bear the positive bending moment; the double Tunnel tunnel is affected by the adjacent tunnel construction, showing a certain biasing effect. The abutment lining side of the tunnel has a small force. The arch foot is the most unfavorable position for the lining structure.