大型沉管隧道管节接头刚度特性研究

发布时间：2018-10-17 13:33

【摘要】：沉管隧道管节接头具有调节沉管隧道受力性能以及适应隧道不均匀变形的功能,在隧道运营中起着非常重要的作用。文章以港珠澳沉管隧道管节接头为研究对象,建立了管节接头刚度的三维非线性有限元计算模型,对管节接头的受力变形特征进行了分析,分别得到了管节接头轴向压缩刚度、弯曲刚度与轴向压缩荷载、压缩弯矩之间的变化规律。结果表明:轴向压缩刚度随轴向压缩荷载增大而增大;轴向弯曲刚度随轴向荷载增大而增大,但在相同轴压下,弯曲刚度随弯矩增大而减小。此外,结合管节接头模型试验进一步研究了管节接头轴向压缩刚度和弯曲刚度的变化规律及影响因素,并对比分析了有限元计算结果与模型试验结果,模型试验得出的接头刚度变化规律与有限元模拟结果一致。研究得到的管节刚度对沉管隧道整体计算研究具有重要参考意义。
[Abstract]:The pipe joint of immersed tunnel has the function of adjusting the mechanical performance of immersed tunnel and adapting to the uneven deformation of tunnel, which plays a very important role in tunnel operation. In this paper, the three-dimensional nonlinear finite element model of the joint stiffness of the pipe joint is established, and the deformation characteristics of the joint are analyzed, and the axial compression stiffness of the joint is obtained respectively by taking the joint of Hong Kong, Zhuhai-Macao immersed tube tunnel as the research object. The variation of bending stiffness, axial compression load and compression moment. The results show that the axial compression stiffness increases with the increase of axial compression load, and the axial bending stiffness increases with the increase of axial load, but under the same axial compression, the bending stiffness decreases with the increase of bending moment. In addition, the variation law of axial compression stiffness and bending stiffness of pipe joint and its influencing factors are further studied, and the results of finite element calculation and model test are compared and analyzed. The stiffness variation of the joint obtained from the model test is consistent with that of the finite element simulation. The stiffness of pipe joints obtained from the study is of great significance to the whole calculation of immersed tunnel.
【作者单位】：上海市地下空间设计研究总院有限公司;同济大学土木工程学院地下建筑与工程系;港珠澳大桥管理局;
【分类号】：U459.5

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