This paper describes a systematic study on the fundamental features of seismic soil pressure on underground tunnels, in terms of its magnitude and distribution, and further identifies the dominant factors that significantly influence the seismic soil pressure. A tunnel embedded in water-saturated poroelastic half-space is considered, with a large variety of model and excitation parameters. The primary features of both the total soil pressure and the pore pressure are investigated. Taking a circular tunnel as an example, the results are presented using a finite element-indirect boundary element (FE-IBE) method, which can account for dynamic soil-tunnel interaction and solid frame-pore water coupling. The effects of tunnel stiff ness, tunnel buried depth and input motions on the seismic soil pressure and pore pressure are also examined. It is shown that the most crucial factors that dominate the magnitude and distribution of the soil pressure are the tunnel stiff ness and dynamic soil-tunnel interaction. Moreover, the solid frame-pore water coupling has a prominent influence on the magnitude of the pore pressure. The findings are beneficial to obtain insight into the seismic soil pressure on underground tunnels, thus facilitating more accurate estimation of the seismic soil pressure.

中文翻译：

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再谈隧道抗震设计的土壤压力和孔隙压力：考虑水饱和的多孔弹性半空间

本文就地下隧道的地震土压力的大小和分布进行了系统的研究，并进一步确定了显着影响地震土压力的主导因素。考虑了一个埋在水饱和多孔弹性半空间中的隧道，具有各种模型和激励参数。研究了总土壤压力和孔隙压力的主要特征。以圆形隧道为例，采用有限元-间接边界元（FE-IBE）方法给出了结果，该方法可以解决动态土-隧道相互作用和固-框架-水耦合问题。还研究了隧道刚度，隧道埋深和输入运动对地震土压力和孔隙压力的影响。结果表明，支配土壤压力大小和分布的最关键因素是隧道的刚度和动态的土-隧道相互作用。此外，固体框架-孔隙水耦合对孔隙压力的大小有显着影响。这些发现有助于深入了解地下隧道的地震土压力，从而有助于更准确地估算地震土压力。