To fill the gap that the impact of segmental joints and water-saturated soil is commonly considered separately in the existing research, this paper proposes a fluid–solid coupling FEM to examine the seismic behaviour of an underwater segmented tunnel, considering the weakening effect of the joints and the dynamic characteristics of the two-phase media simultaneously, with different input ground motions, buried depth, and soil stiffness. The presence of segmental joints leads to an increase of pore water pressure in the surrounding saturated soil of the tunnel, implying a greater probability of liquefaction. It also leads to an increase in the tunnel deformation due to a reduction of stiffness. Furthermore, although it beneficially decreases the overall lining forces, it is found to significantly increase the compressive stress at the lining edges near the segmental joints, inducing stress concentration accordingly. Finally, the compressive stress of the tunnel lining and pore water pressure of saturated soil have the most and the least sensitivity to the weakening effect of joints, respectively.

中文翻译：

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使用基于 Biot 理论的新型流固耦合有限元法研究水饱和多孔弹性土中分段隧道的抗震性能

为了弥补现有研究中通常单独考虑管片节理和水饱和土的影响的空白，本文提出一种流固耦合有限元法来研究水下节段隧道的地震行为，考虑节段节理的弱化效应。同时具有不同输入地面运动、埋深和土壤刚度的节理和两相介质的动态特性。节段节理的存在导致隧道周围饱和土的孔隙水压力增加，意味着液化的可能性更大。由于刚度降低，还会导致隧道变形增加。此外，虽然它有利于降低整体衬砌力，但发现显着增加了管片接缝附近衬砌边缘处的压应力，相应地引起应力集中。最后，隧道衬砌压应力和饱和土孔隙水压力分别对节理弱化效应的敏感性最大和最小。