单洞双线盾构隧道中隔墙顶部节点形式与力学性能研究

Forms and Mechanical Performance of Prefabricated Partition Walls′ Top Connectors in Single-Tube Double-Track Shield Tunnels

为探究单洞双线盾构隧道中隔墙合适的顶部节点形式及各节点形式的力学性能,总结现有工程中隔墙顶部节点形式,并对各节点形式提出简化模型,采用理论方法对简化模型力学性能进行分析,并利用数值模型验证简化模型的合理性及各节点形式的力学性能与适用范围,得到如下结论:1)螺栓配合角钢或连接件的方式更适合于全预制中隔墙;2)所提出的简化模型具有较好的参考性,可应用于中隔墙顶部节点的初步设计;3)顶部采用连接件可形成协调受力,提高顶部节点受力性能,建议今后单洞双线盾构隧道中隔墙顶部节点采用该形式。此外,竖向铰支座模型受力形式合理,今后工程可基于该模型进行实践探索。

To investigate the optimal top connector forms for partition walls and the mechanical properties of each connector form in single-tube double-track shield tunnels,a review of top connectors in existing projects is presented,and simplified calculation models for each connector form are established.The mechanical properties of these models are analyzed using theoretical methods.In addition,the validity of the simplified models and the mechanical properties,along with the applicable ranges of each connector form,are confirmed through numerical simulations.The key findings are as follows:(1)Bolts with angle steels orπsteels are most effective for fully-prefabricated partition walls.(2)The simplified model provides reliable references and is suitable for the preliminary design of top connectors in partition walls.(3)Theπ-shaped steel connectors enhance the mechanical properties of the top connectors and are thus recommended for use in future similar projects.Moreover,the vertical hinge model proves to be reasonable and serves as a foundational reference for future research in this area.