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首页> 外文期刊>Arabian Journal for Science and Engineering >Dynamic Response of Segment Lining of Overlapped Shield Tunnels Under Train-Induced Vibration Loads
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Dynamic Response of Segment Lining of Overlapped Shield Tunnels Under Train-Induced Vibration Loads

机译：列车引起的振动荷载作用下重叠式盾构隧道管片动力响应

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摘要

The dynamic response of the overlapped shield tunnels subjected to the train-induced vibration is studied using a nonlinear finite element software. A three-dimensional numerical model is established, and the fabricated segment linings which contain steel bars are used to simulate the shield tunnel. The interaction behaviors, i.e., tensile, shear, and bending, between segment linings are successfully captured by defining the segment lining circumference interface and the joint bolt model. The results show that the dynamic response of the segment linings of the overlapped shield tunnels is affected by the vibration loads caused by the running trains. The additional internal forces generated in the shield tunnels with the fabricated segment linings (joint interfaces are explicitly represented) are larger than those of tunnels which use homogeneous equivalent stiffness model. The opening and staggered deformation response of the joint interfaces is related to the train locations. The axial force and shear response of the bolt under the dynamic load of the train are closely associated with the opening and staggered deformation of joints. The steel spring floating slab can greatly reduce the vertical acceleration and the displacement at the arch bottom of the lower tunnel. The vertical acceleration and the displacement of the bottom arch at the L-III segment lining with the steel spring floating plates are 0.65 times and 0.78 times of the tunnels without the steel spring floating plates, respectively. This study reveals the vibration response features of the overlapped shield tunnels under the train-induced vibration loads, which will help improve the waterproofing capacity and stability of shield tunnels.
机译：使用非线性有限元软件研究了重叠的盾构隧道在列车引起的振动下的动力响应。建立了三维数值模型，并使用包含钢筋的分段式衬砌来模拟盾构隧道。通过定义节段衬砌圆周界面和连接螺栓模型，可以成功捕获节段衬砌之间的相互作用行为，即拉伸，剪切和弯曲。结果表明，重叠的盾构隧道管片衬砌的动力响应受行车引起的振动载荷的影响。与使用均质等效刚度模型的隧道相比，在带有预制分段衬砌的盾构隧道中产生的附加内力要大得多（显式表示了节点界面）。接头界面的打开和交错变形响应与列车位置有关。列车动载荷作用下螺栓的轴向力和剪切响应与接头的打开和错位变形密切相关。钢弹簧浮板可以大大降低竖向加速度和下部隧道拱底处的位移。带有钢制弹簧浮板的L-III段衬砌的底拱的垂直加速度和位移分别是不带钢制弹簧浮板的隧道的0.65倍和0.78倍。这项研究揭示了在列车引起的振动荷载作用下，重叠式盾构隧道的振动响应特征，这将有助于提高盾构隧道的防水能力和稳定性。

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