A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic vulnerability of shallow tunnels subjected to far-field long-period ground motions
https://orcid.org/0000-0002-8294-5520
https://orcid.org/0000-0001-7587-2004
https://orcid.org/0000-0002-1760-9838
Abstract Extensive documentation and research have highlighted the destructive impact of near-field earthquakes on underground structures, while the effects of far-field earthquakes remain relatively less explored. In regions such as Bangkok and Singapore, where active seismic faults are located at a significant distance, the influence of far-field motions on tunnels tends to be ignored. However, far-field earthquakes are generally less destructive than near-field motions due to their low peak ground acceleration, peak ground velocity, and Arias intensity, resulting in lower energy. Conversely, far-field earthquakes tend to have a longer duration than near-field and a higher probability of containing long-period waves, which can lead to higher responses in the low-frequency region of the response spectrum. When these far-field ground motions are applied to thick layers of soft natural clays, a common geological feature in Bangkok, they can undergo significant amplification in the long-period range, resulting in large soil displacements and shear strains. Consequently, this induces significant forces in the tunnel lining comparable to those generated by near-field earthquakes. This paper presents a comprehensive study of this rarely investigated topic, using advanced numerical simulations to analyse the seismic behaviour of a shallow circular tunnel in Bangkok soft clays subjected to long-period earthquakes. The results show that far-field earthquakes have the potential to generate forces in the tunnel lining that are equally destructive as those induced by near-field motions. Therefore, these far-field effects should be accounted for in the seismic design of tunnels.
Highlights Behaviour of shallow tunnels in soft clays under far-field motion is investigated. Soil structure degradation induced by earthquake loading is accounted for. Soil structure degradation leads to higher levels of shear strain in the soil. Soil destructuration facilitates the transmission of higher loads to the tunnel lining. Far-field motion can cause significant damage to the tunnel lining as near-field.
Seismic vulnerability of shallow tunnels subjected to far-field long-period ground motions
https://orcid.org/0000-0002-8294-5520
https://orcid.org/0000-0001-7587-2004
https://orcid.org/0000-0002-1760-9838
Abstract Extensive documentation and research have highlighted the destructive impact of near-field earthquakes on underground structures, while the effects of far-field earthquakes remain relatively less explored. In regions such as Bangkok and Singapore, where active seismic faults are located at a significant distance, the influence of far-field motions on tunnels tends to be ignored. However, far-field earthquakes are generally less destructive than near-field motions due to their low peak ground acceleration, peak ground velocity, and Arias intensity, resulting in lower energy. Conversely, far-field earthquakes tend to have a longer duration than near-field and a higher probability of containing long-period waves, which can lead to higher responses in the low-frequency region of the response spectrum. When these far-field ground motions are applied to thick layers of soft natural clays, a common geological feature in Bangkok, they can undergo significant amplification in the long-period range, resulting in large soil displacements and shear strains. Consequently, this induces significant forces in the tunnel lining comparable to those generated by near-field earthquakes. This paper presents a comprehensive study of this rarely investigated topic, using advanced numerical simulations to analyse the seismic behaviour of a shallow circular tunnel in Bangkok soft clays subjected to long-period earthquakes. The results show that far-field earthquakes have the potential to generate forces in the tunnel lining that are equally destructive as those induced by near-field motions. Therefore, these far-field effects should be accounted for in the seismic design of tunnels.
Highlights Behaviour of shallow tunnels in soft clays under far-field motion is investigated. Soil structure degradation induced by earthquake loading is accounted for. Soil structure degradation leads to higher levels of shear strain in the soil. Soil destructuration facilitates the transmission of higher loads to the tunnel lining. Far-field motion can cause significant damage to the tunnel lining as near-field.
Seismic vulnerability of shallow tunnels subjected to far-field long-period ground motions
https://orcid.org/0000-0002-8294-5520
https://orcid.org/0000-0001-7587-2004
https://orcid.org/0000-0002-1760-9838
Abstract Extensive documentation and research have highlighted the destructive impact of near-field earthquakes on underground structures, while the effects of far-field earthquakes remain relatively less explored. In regions such as Bangkok and Singapore, where active seismic faults are located at a significant distance, the influence of far-field motions on tunnels tends to be ignored. However, far-field earthquakes are generally less destructive than near-field motions due to their low peak ground acceleration, peak ground velocity, and Arias intensity, resulting in lower energy. Conversely, far-field earthquakes tend to have a longer duration than near-field and a higher probability of containing long-period waves, which can lead to higher responses in the low-frequency region of the response spectrum. When these far-field ground motions are applied to thick layers of soft natural clays, a common geological feature in Bangkok, they can undergo significant amplification in the long-period range, resulting in large soil displacements and shear strains. Consequently, this induces significant forces in the tunnel lining comparable to those generated by near-field earthquakes. This paper presents a comprehensive study of this rarely investigated topic, using advanced numerical simulations to analyse the seismic behaviour of a shallow circular tunnel in Bangkok soft clays subjected to long-period earthquakes. The results show that far-field earthquakes have the potential to generate forces in the tunnel lining that are equally destructive as those induced by near-field motions. Therefore, these far-field effects should be accounted for in the seismic design of tunnels.
Highlights Behaviour of shallow tunnels in soft clays under far-field motion is investigated. Soil structure degradation induced by earthquake loading is accounted for. Soil structure degradation leads to higher levels of shear strain in the soil. Soil destructuration facilitates the transmission of higher loads to the tunnel lining. Far-field motion can cause significant damage to the tunnel lining as near-field.
Seismic vulnerability of shallow tunnels subjected to far-field long-period ground motions
Cabangon, Lowell Tan (author) / Elia, Gaetano (author) / Rouainia, Mohamed (author) / Keawsawasvong, Suraparb (author) / Ornthammarath, Teraphan (author)
2023-10-18
Article (Journal)
Electronic Resource
English
Seismic response of steel structures subjected to near-field ground motions
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| Taylor & Francis Verlag | 2023
| British Library Online Contents | 2010