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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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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Abstract 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.
AbstractList 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.
Author TSUNO, Kiwamu
FUNAKOSHI, Koji
FUJITA, Kiichi
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  organization: Tunnel Engineering Laboratory, Structures Technology Division
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References [2] Ministry of Land, Infrastructure, Transport and Tourism and Railway Technical research institute, Design Standards for Railway Structures and Commentary (Tunnel, shield), Maruzen Publishing Co., Ltd., pp. 235-236, 2022 (in Japanese).
[3] Ministry of Land, Infrastructure, Transport and Tourism and Railway Technical research institute, Design Standards for Railway Structures and Commentary (Seismic Design), Maruzen Publishing Co., Ltd., p. 47, 2012 (in Japanese).
[1] Funakoshi, K., Fujita, K., and Tsuno, K., "Seismic design of shield tunnel located in the ground change point in the longitudinal direction," Proceeding of the Japan national conference on geotechnical engineering, Vol. 54, pp. 1429-1430, 2019 (in Japanese).
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References_xml – reference: [3] Ministry of Land, Infrastructure, Transport and Tourism and Railway Technical research institute, Design Standards for Railway Structures and Commentary (Seismic Design), Maruzen Publishing Co., Ltd., p. 47, 2012 (in Japanese).
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– reference: [2] Ministry of Land, Infrastructure, Transport and Tourism and Railway Technical research institute, Design Standards for Railway Structures and Commentary (Tunnel, shield), Maruzen Publishing Co., Ltd., pp. 235-236, 2022 (in Japanese).
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SubjectTerms Axial forces
Bending moments
Inclination angle
longitudinal direction
performance-based design method
Seismic design
Shear forces
shield tunnel
Stiffness
Tunneling shields
Title Seismic Design Method for Shield Tunnels in Ground Conditions Subject to Change in the Longitudinal Direction
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