Numerical study of seismic resistance of prefabricated circular tunnel linings

Ilya Guskov, E. Pestryakova
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Abstract

Prefabricated circular tunnel linings are used in the construction of tunnels using the shield method, which significantly increases the speed and reduces the cost of building highways. Many methods have been developed for designing seismic resistant tunnel linings. Due to simplicity, analytical methods are usually used for preliminary design. In this case, the presence of joints between the blocks of the ring and between the rings is not taken into account. Compared to analytical methods, numerical methods, especially three-dimensional (3D), allow the most explicit consideration of the problem being solved. However, due to their complexity and time-consuming nature, 3D numerical models are only rarely used. In most reinforced concrete prefabricated linings, the deformation at the joints has a significant effect on the deformation of the rings. Thus, the magnitude and distribution of internal forces largely depend on the distribution and characteristics of the joints. Therefore, one of the most important factors in the design of a circular tunnel lining is the effect of segment connections on its overall behavior. This paper compares the internal forces that occur in the tunnel lining, determined using analytical analysis and numerical simulation in a three-dimensional formulation. When using numerical analysis methods, seismic loads are considered as quasi-static. However, almost all quasi-static analyzes presented in the literature include the same assumptions as closed form solutions and therefore have the same limited applicability. The main disadvantage of quasi-static models is that they do not take into account changes in the behavior of the structure over time.
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预制圆形隧道衬砌抗震性数值研究
采用盾构法建造隧道时使用了预制圆形隧道衬砌,这大大提高了建造高速公路的速度并降低了成本。抗震隧道衬砌的设计方法有很多。由于简单,初步设计通常采用分析方法。在这种情况下,没有考虑到环块之间和环块之间的接缝。 与分析方法相比,数值方法,尤其是三维(3D)数值方法,可以最明确地考虑所要解决的问题。然而,由于其复杂性和耗时性,三维数值模型很少使用。 在大多数钢筋混凝土预制衬里中,接缝处的变形对环圈的变形有很大影响。因此,内力的大小和分布在很大程度上取决于接缝的分布和特征。因此,环形隧道衬砌设计中最重要的因素之一就是分段连接对其整体行为的影响。 本文比较了隧道衬砌中出现的内力,这些内力是在三维模型中通过分析和数值模拟确定的。 使用数值分析方法时,地震荷载被视为准静态荷载。然而,文献中介绍的几乎所有准静态分析都包含与闭合形式解决方案相同的假设,因此适用性同样有限。准静力模型的主要缺点是没有考虑结构行为随时间的变化。
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