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为了研究不对称连拱隧道的施工与受力情况,以兰海高速孟家磨不对称连拱隧道为工程背景,通过对隧道施工过程进行数值模拟,以及对两种不同施工工序下围岩和支护结构的受力及变形情况进行对比分析,结果表明,先施工小断面隧道时的拱顶沉降、初期支护应力、中墙水平位移及应力、二次衬砌的应力基本都小于先施工大断面隧道时产生的位移及应力值,并且大断面隧道一侧的中隔墙与拱脚相接处的压应力比较大,先施工小断面隧道较为安全可靠,可为今后类似工程设计及施工提供参考和借鉴。
In order to study the construction and stress of asymmetrical double-arch tunnel, taking Lanhai high-speed Mengjia mill asymmetric double-arch tunnel as the engineering background, through numerical simulation of tunnel construction process, The results show that the stress of the secondary lining is less than that of the first construction when the settlement of the vault, the initial support stress, the displacement and the stress of the middle wall of the small section tunnel when the tunnel is constructed first, Section of the tunnel when the displacement and stress values, and the large section of the tunnel side of the wall and the arch abutment at the compressive stress is relatively large, first construction of small sections of the tunnel is relatively safe and reliable for future similar engineering design and construction to provide Reference and reference.