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城市急曲线盾构隧道工程的近接施工,会引起复杂的地层效应和隧道结构内力,施工难度大。广州城市轨道交通5号线动物园～杨箕区间隧道为典型的近接急曲线盾构隧道,具有大坡度、急曲线、上下重叠、近接施工等特点,为了确保工程的顺利开展,需正确理解和评估两隧道的相互作用。基于有限元分析,对此急曲线隧道区段上下重叠、45°平行与水平平行三种典型近接施工进行了数值模拟,分析研究了后建隧道对先建隧道的相互影响,对隧道结构内力与变形以及地层位移的变化规律分别进行了总结分析,所得结论指导了工程现场施工,为同类工程积累了经验。
Close proximity construction of urban emergency curve shield tunneling project will cause complicated formation effect and internal force of tunnel structure, and construction is difficult. Guangzhou Urban Rail Transit Line 5 Zoo-Yangji Interval Tunnel is a typical short-circuit emergency shield tunnel with large slope, sharp curve, overlapping up and down and close construction. In order to ensure the smooth development of the project, it is necessary to correctly understand and evaluate Interaction between two tunnels. Based on the finite element analysis, three kinds of typical abutment constructions with overlapping and 45 ° parallel and horizontal parallel sections were simulated numerically. The interaction between the post-built tunnel and the pre-built tunnel was analyzed and studied. Deformation and formation displacement of the rules were analyzed, the conclusions of the guidance of the construction site engineering, accumulated experience for similar projects.