Effect of Submarine Slope Inclination on Seismic Response of Deep Tunnels

DOI

10.2991/978-94-6463-793-9_95How to use a DOI?

Keywords

Tunnel; Lining internal forces; Seawater-sediment-bedrock model; Double-layer site; Permeability coefficient

Abstract

Unlike horizontal seabeds, offshore seabeds typically exhibit varying inclination angles. This inclined topography alters both the propagation paths and reflection characteristics of seismic waves, leading to significant variations in seismic impacts across different seabed zones. As a key structural element on offshore seabeds, analyzing extreme internal forces in tunnel cross-sections enables more economical and safer designs for different tunnel segments.Based on a layered seabed model (seawater-sediment-bedrock), this study calculates the stress field at the tunnel center under P-waves transmitted from bedrock, and further determines peak internal forces in tunnel linings. By systematically investigating the effects of seabed inclination angle, sediment permeability coefficient on lining force extremes, this research provides critical insights for offshore tunnel design. Key findings include:Seabed inclination predominantly influences seismic response characteristics under long-period ground motions, with tunnel lining thrust and bending moments escalating significantly as inclination increases; Except in low-frequency ranges, the most pronounced inclination effects on lining forces occur near the seabed's natural frequency; At constant inclination, reduced permeability coefficients lead to progressive increases in lining internal forces under low-frequency seismic actions.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Wang Xiong
AU  - Zhendong Shan
PY  - 2025
DA  - 2025/07/28
TI  - Effect of Submarine Slope Inclination on Seismic Response of Deep Tunnels
BT  - Proceedings of the 2025 8th International Conference on Traffic Transportation and Civil Architecture (ICTTCA 2025)
PB  - Atlantis Press
SP  - 1128
EP  - 1143
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-793-9_95
DO  - 10.2991/978-94-6463-793-9_95
ID  - Xiong2025
ER  -