Response Law of Shield Tunnel under Water-Rich Sand and Gravel Formation Based on Fluid-Solid Coupling Effect

DOI

10.2991/978-94-6463-726-7_20How to use a DOI?

Keywords

shield tunnel; orthogonal test; numerical analysis; sandy pebble stratum

Abstract

Taking the water-rich pebble stratum under a subway tunnel as the engineering background, this paper explores the mechanical response characteristics of multi factor changes in shield tunnel construction to the tunnel stratum. Based on numerical simulation and combined with fluid structure coupling effect, the influence law of passive factors (buried depth and head height) on tunnel seepage field, stress field and displacement field are studied. At the same time, the influence of active factors (segment width, equivalent layer thickness and soil bin pressure) on tunnel safety evaluation index is studied combined with orthogonal test. The results show that the pore water pressure around the lining is positively correlated with the buried depth and head height, and the pore water pressure at each position of the outer wall of the lining is: arch waist > arch bottom > arch crown; the surrounding rock stress increases linearly with the buried depth and head height, and is symmetrical along the axial direction of the tunnel, and the stress growth rate of each position is more affected by the head height Large; at a single section, the stratum settlement and horizontal displacement are positively correlated with the head height, and the buried depth has little effect on the horizontal displacement, but the influence range extends to a certain extent; when taking the maximum surface settlement, maximum transverse displacement and maximum segment bending moment as the evaluation indexes, it is analyzed that the segment width and silo pressure are the main effects (significant) Factor, while the thickness of equivalent layer is a general (insignificant) factor.

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  - Ningquan Cao
AU  - Hailong Duan
AU  - Zhiming Xu
PY  - 2025
DA  - 2025/06/13
TI  - Response Law of Shield Tunnel under Water-Rich Sand and Gravel Formation Based on Fluid-Solid Coupling Effect
BT  - Proceedings of the 2024 6th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2024)
PB  - Atlantis Press
SP  - 198
EP  - 203
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-726-7_20
DO  - 10.2991/978-94-6463-726-7_20
ID  - Cao2025
ER  -