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为确保隧道施工安全、减少开挖跨度和节约工程投资,针对某依托工程,首先通过ADINA有限元数值模拟,对不同中墙形状下隧道中墙的受力与变形特征进行了分析,选取了复合式中墙最佳形状,在此基础上,对不同中墙厚度时围岩位移、中墙位移与中墙应力等变化全过程进行了研究,并通过现场监控量测对数值模拟结果进行了对比和验证分析。优化了大跨扁平连拱隧道中墙形状,提出了中墙配筋的关键控制因素和Ⅴ级围岩地段合理中墙厚度。
In order to ensure the safety of the tunnel construction, reduce the excavation span and save the project investment, aiming at some relying project, the force and deformation characteristics of the middle wall of the tunnel under different middle wall shape were analyzed by ADINA numerical simulation. Based on this, the whole process of wall displacement, mid-wall displacement and mid-wall stress during different thickness of middle wall was studied, and the numerical simulation results were compared by on-site monitoring measurement And verification analysis. The shape of the middle wall of the large span flat arch tunnel is optimized. The key control factors of the middle wall reinforcement and the reasonable wall thickness of the grade V surrounding rock are proposed.