Seismic Design Method for Shield Tunnels in Ground Conditions Subject to Change in the Longitudinal Direction

The authors of this paper investigated the effect of seismic motion on shield tunnels that are located in areas with varying ground conditions. This research revealed that the larger the inclination angle of a boundary between a basic layer and a soft layer becomes, the larger the sectional forces,...

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Bibliographic Details
Published inQuarterly Report of RTRI Vol. 64; no. 1; pp. 27 - 32
Main Authors TSUNO, Kiwamu, FUJITA, Kiichi, FUNAKOSHI, Koji
Format Journal Article
LanguageEnglish
Published Tokyo Railway Technical Research Institute 01.02.2023
Japan Science and Technology Agency
Subjects
Axial forces
Bending moments
Inclination angle
longitudinal direction
performance-based design method
Seismic design
Shear forces
shield tunnel
Stiffness
Tunneling shields
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Summary:The authors of this paper investigated the effect of seismic motion on shield tunnels that are located in areas with varying ground conditions. This research revealed that the larger the inclination angle of a boundary between a basic layer and a soft layer becomes, the larger the sectional forces, such as axial force, bending moment and shear force become. In addition, the sectional force obtained by an equivalent stiffness beam model was found to be larger than that obtained by a beam-spring model. This research also confirmed that results using a beam-spring model when the inclination angle is 5.9 degrees satisfy verification requirements.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0033-9008
1880-1765
DOI:10.2219/rtriqr.64.1_27