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Seismic response of tunnel lining structure in a thick expansive soil stratum

机译：厚膨胀土层隧道衬砌结构的地震响应

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摘要

The seismic response of a tunnel lining structure is essential for its safety design and construction. The objective of this study is to investigate the seismic response of a tunnel lining structure embedded in a thick expansive soil stratum. First, the deformation and internal force characteristics of tunnel lining structure under seismic action are evaluated from a theoretical perspective. Second, a finite element (FE) analysis is carried out of the seismic responses of the tunnel lining structure and ground stratum. In the FE analysis, the bolted connections in the tunnel lining structure are simulated using the local stiffness reduction method (LSRM). The LSRM reduces the stiffness of the lining segments affected directly by the bolted connections using a stiffness reduction coefficient (SRC), while leaves the stiffness of the rest of the lining segments to remain to be unchanged. The results indicate that under the effect of transversal waves propagating in the direction perpendicular to tunnel axis, the transversal displacement characteristics of the tunnel lining structure are almost identical to that of the surrounding soil stratum. They both decrease with an increase in buried depth. The circumferential distributions of shear force, bending moment, and axial force in lining segments are varied, but the magnitudes of them increase with an increase in SRC.
机译：隧道衬砌结构的地震响应对于其安全设计和施工至关重要。本研究的目的是研究埋在厚膨胀土层中的隧道衬砌结构的地震响应。首先，从理论的角度评估了隧道衬砌结构在地震作用下的变形和内力特性。其次，对隧道衬砌结构和地层的地震响应进行了有限元分析。在有限元分析中，使用局部刚度折减法（LSRM）模拟隧道衬砌结构中的螺栓连接。 LSRM使用刚度降低系数（SRC）降低了直接受到螺栓连接影响的衬砌段的刚度，同时使其余衬砌段的刚度保持不变。结果表明，在垂直于隧道轴线方向传播的横向波的作用下，隧道衬砌结构的横向位移特性与周围土层的位移特性几乎相同。它们都随着埋深的增加而减小。衬砌节段中剪切力，弯矩和轴向力的周向分布是变化的，但是它们的大小会随着SRC的增加而增加。

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