Sub-Rectangular Tunnel Behavior under Seismic Loading

Circular and rectangular tunnel shapes are usually chosen when excavating at shallow depths in urban areas. However, special-shaped tunnels such as sub-rectangular tunnels have recently been used to overcome some drawbacks of circular and rectangular tunnels in terms of low space utilization efficie...

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Autores principales: Van Vi Pham, Ngoc Anh Do, Daniel Dias
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
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Acceso en línea:https://doaj.org/article/98bb9bf384f44efca4160d72b9f3f6a0
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spelling oai:doaj.org-article:98bb9bf384f44efca4160d72b9f3f6a02021-11-11T15:00:34ZSub-Rectangular Tunnel Behavior under Seismic Loading10.3390/app112199092076-3417https://doaj.org/article/98bb9bf384f44efca4160d72b9f3f6a02021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9909https://doaj.org/toc/2076-3417Circular and rectangular tunnel shapes are usually chosen when excavating at shallow depths in urban areas. However, special-shaped tunnels such as sub-rectangular tunnels have recently been used to overcome some drawbacks of circular and rectangular tunnels in terms of low space utilization efficiency and stress concentration, respectively. In the literature, experimental studies as well as analytical and numerical models have been developed for the seismic analysis and vulnerability assessment of circular and rectangular tunnels since the early 1990s. However, knowledge gaps regarding the behavior of sub-rectangular tunnels under seismic loading remain and still need to be bridged. The present paper focuses on introducing a numerical analysis of sub-rectangular tunnels under seismic loading. The numerical model of sub-rectangular tunnels is developed based on the numerical analyses of circular tunnels validated by comparing well-known, analytical solutions. This paper aims to highlight the differences between the behavior of sub-rectangular tunnels compared with circular tunnels when subjected to seismic loadings. Special attention is paid to the soil–lining interface conditions. The influence of parameters, such as soil deformations, maximum horizontal acceleration, and lining thickness, on sub-rectangular tunnel behavior under seismic loading is also investigated. The results indicate a significant behavior difference between sub-rectangular and circular tunnels. The absolute extreme incremental bending moments for a circular tunnel (no-slip condition) are smaller than that for the corresponding full-slip condition. The absolute extreme incremental bending moments of sub-rectangular tunnels (no-slip condition) are, however, greater than the corresponding full-slip conditions.Van Vi PhamNgoc Anh DoDaniel DiasMDPI AGarticlesub-rectangular tunnelseismic loadtunnel liningnumerical analysisTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9909, p 9909 (2021)
institution DOAJ
collection DOAJ
language EN
topic sub-rectangular tunnel
seismic load
tunnel lining
numerical analysis
Technology
T
Engineering (General). Civil engineering (General)
TA1-2040
Biology (General)
QH301-705.5
Physics
QC1-999
Chemistry
QD1-999
spellingShingle sub-rectangular tunnel
seismic load
tunnel lining
numerical analysis
Technology
T
Engineering (General). Civil engineering (General)
TA1-2040
Biology (General)
QH301-705.5
Physics
QC1-999
Chemistry
QD1-999
Van Vi Pham
Ngoc Anh Do
Daniel Dias
Sub-Rectangular Tunnel Behavior under Seismic Loading
description Circular and rectangular tunnel shapes are usually chosen when excavating at shallow depths in urban areas. However, special-shaped tunnels such as sub-rectangular tunnels have recently been used to overcome some drawbacks of circular and rectangular tunnels in terms of low space utilization efficiency and stress concentration, respectively. In the literature, experimental studies as well as analytical and numerical models have been developed for the seismic analysis and vulnerability assessment of circular and rectangular tunnels since the early 1990s. However, knowledge gaps regarding the behavior of sub-rectangular tunnels under seismic loading remain and still need to be bridged. The present paper focuses on introducing a numerical analysis of sub-rectangular tunnels under seismic loading. The numerical model of sub-rectangular tunnels is developed based on the numerical analyses of circular tunnels validated by comparing well-known, analytical solutions. This paper aims to highlight the differences between the behavior of sub-rectangular tunnels compared with circular tunnels when subjected to seismic loadings. Special attention is paid to the soil–lining interface conditions. The influence of parameters, such as soil deformations, maximum horizontal acceleration, and lining thickness, on sub-rectangular tunnel behavior under seismic loading is also investigated. The results indicate a significant behavior difference between sub-rectangular and circular tunnels. The absolute extreme incremental bending moments for a circular tunnel (no-slip condition) are smaller than that for the corresponding full-slip condition. The absolute extreme incremental bending moments of sub-rectangular tunnels (no-slip condition) are, however, greater than the corresponding full-slip conditions.
format article
author Van Vi Pham
Ngoc Anh Do
Daniel Dias
author_facet Van Vi Pham
Ngoc Anh Do
Daniel Dias
author_sort Van Vi Pham
title Sub-Rectangular Tunnel Behavior under Seismic Loading
title_short Sub-Rectangular Tunnel Behavior under Seismic Loading
title_full Sub-Rectangular Tunnel Behavior under Seismic Loading
title_fullStr Sub-Rectangular Tunnel Behavior under Seismic Loading
title_full_unstemmed Sub-Rectangular Tunnel Behavior under Seismic Loading
title_sort sub-rectangular tunnel behavior under seismic loading
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/98bb9bf384f44efca4160d72b9f3f6a0
work_keys_str_mv AT vanvipham subrectangulartunnelbehaviorunderseismicloading
AT ngocanhdo subrectangulartunnelbehaviorunderseismicloading
AT danieldias subrectangulartunnelbehaviorunderseismicloading
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