基于循环模型的盾构隧道地铁列车行车性能分析

Analysis of the running performance of subway trains in shield tunnels based on a cyclic model

为提高盾构隧道中地铁列车运行性能分析的效率,构建一种循环计算模型。这一模型将地铁列车、轨道、盾构管片和土体形成一个闭环,目的在于通过减少自由度数量,缩短计算时间。模型中,地铁列车采用多刚体动力学进行模拟,而钢轨、轨道、盾构管片以及土体则通过有限元法进行建模。这两部分通过轮轨接触关系进行耦合。依据已有文献及完整模型的计算结果,进行循环模型计算准确性的验证。结果显示,提出的模型计算结果与完整模型相符,且所需的自由度数量仅为完整模型的1/5。最后,以长乐滨海快线机场站至中间风井区间的盾构区间为例,分析轨道结构动力响应及列车的运行安全性、平稳性和舒适性。分析结果显示,所有指标均符合规定要求。

In an effort to enhance the efficacy of evaluating the operational performance of subway trains in shield tunnels,a cyclical calculation model was put forward.This model establishes a comprehensive loop encompassing subway trains,tracks,shield tunnel sections,and soil,which effectively diminishes the degrees of freedom,thus accelerating the calculation process.The train was emulated utilizing multi-rigid body dynamics,while the rail,track,segment and soil were modeled using the finite element method,both of which were interconnected through wheel-rail contact.The accuracy of the proposed model was corroborated based on the extant literature as well as the calculation outcomes from the comprehensive model.It was found that the calculation outcomes from the proposed model were in alignment with those from the comprehensive model,necessitating merely 20%of the degrees of freedom required by the latter.As a case study,the shield tunneling section between Changle Binhai Express Airport station and the central air shaft was examined.The track structure dynamical response and the safety,ride smoothness,and passenger comfort of train operation were scrutinized,with the results indicating that all specified criteria were met.