Seismic Response Characteristics of a Tunnel Portal Subjected to Topographical and Geological Asymmetsric Loading

IF 0.3 4区工程技术 Q4 ENGINEERING, MULTIDISCIPLINARY Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria Pub Date : 2023-01-01 DOI:10.23967/j.rimni.2023.10.001

F. Peng, S. Fang

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Abstract

The tunnel portal is the most seismically vulnerable section of the tunnel against earthquakes. Due to the combined effects of topographic and geological asymmetric loading, the mechanical characteristics of this type of portal are very complex. In this study, a three-dimensional numerical model was developed and calculated to investigate the seismic response characteristics of a tunnel portal subjected to topographic and geological asymmetric loading. The results show that the seismic weakness of the tunnel support structure is located at the tunnel arch shoulders and sidewalls; the time to reach the peak displacement around the tunnel is slightly delayed compared to the slope, and the time to reach the peak displacement shows a phased pattern. Compared to the tunnel structure, the slopes are more prone to landslides and other disasters due to terrain and geological factors under earthquake action. Therefore, more attention should be paid to the seismic and anti-seismic design of tunnel slopes.

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地形与地质不对称荷载作用下隧道洞门的地震反应特征

隧道洞口是隧道最易受地震影响的部分。由于地形和地质不对称荷载的共同作用，这类闸门的力学特性非常复杂。本文建立并计算了三维数值模型，研究了地形和地质不对称荷载作用下隧道入口的地震响应特征。结果表明:隧道支护结构的地震弱点位于隧道拱肩和侧壁;与边坡相比，隧道周围的峰值位移时间略有延迟，且峰值位移时间呈阶段性变化。与隧道结构相比，在地震作用下，由于地形和地质因素的影响，边坡更容易发生滑坡等灾害。因此，应重视隧道边坡的抗震设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria 工程技术-工程：综合

CiteScore

0.70

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： International Journal of Numerical Methods for Calculation and Design in Engineering (RIMNI) contributes to the spread of theoretical advances and practical applications of numerical methods in engineering and other applied sciences. RIMNI publishes articles written in Spanish, Portuguese and English. The scope of the journal includes mathematical and numerical models of engineering problems, development and application of numerical methods, advances in software, computer design innovations, educational aspects of numerical methods, etc. RIMNI is an essential source of information for scientifics and engineers in numerical methods theory and applications. RIMNI contributes to the interdisciplinar exchange and thus shortens the distance between theoretical developments and practical applications.