Numerical Analysis on Influence of Sinking Processes of Immersed Tube Tunnels on Stability of Seabed Foundation Trench Slopes

NIU Ben; CHEN Weiyun; LIU Zhijun; WANG Dan

doi:10.13204/j.gyjzG22102905

Volume 53 Issue 6

Jun. 2023

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NIU Ben, CHEN Weiyun, LIU Zhijun, WANG Dan. Numerical Analysis on Influence of Sinking Processes of Immersed Tube Tunnels on Stability of Seabed Foundation Trench Slopes[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(6): 31-36. doi: 10.13204/j.gyjzG22102905

Citation:

NIU Ben, CHEN Weiyun, LIU Zhijun, WANG Dan. Numerical Analysis on Influence of Sinking Processes of Immersed Tube Tunnels on Stability of Seabed Foundation Trench Slopes[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(6): 31-36. doi: 10.13204/j.gyjzG22102905

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Numerical Analysis on Influence of Sinking Processes of Immersed Tube Tunnels on Stability of Seabed Foundation Trench Slopes

doi: 10.13204/j.gyjzG22102905

NIU Ben¹,
CHEN Weiyun^{2
,
,},
LIU Zhijun³,
WANG Dan⁴

1. Guangzhou City Center Transport Project Office, Guangzhou 510030, China;
2. School of Civil Engineering, Sun Yat-Sen University, Guangzhou 510062, China;
3. CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China;
4. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China

Received Date: 2022-10-29
Available Online: 2023-08-18

Abstract

Abstract

The stability evaluation of foundation trench slopes of immersed tube tunnels in the marine dynamic environment has an important research value. As a key link in the construction process of immersed tube tunnels, the sinking of tube segments of tunnels may have an adverse impact on the stability of foundation trench slopes. The dynamic stability of submarine foundation trench slopes in the sinking stage of tube segments of tunnels was numerically simulated and analyzed. The wave-current pressure calculated by wave-current fields was applied to the slope of the foundation trench and the ambient seabed surface near it, and the pore pressure caused by the wave pressure in the seabed was calculated by Darcy's law. Mohr-Coulomb model was used for seabed soil, and the slope stability coefficient was calculated by the strength reduction method. The safety factors of the slope at different times were continuously obtained, and the minimum value of the dynamic safety factor was taken as the stability evaluation index of the slope in the whole process under wave dynamic action. The flow field distribution of the foundation trench slope and its influence on the stability of foundation trench slope were discussed in the cases of with or without wave loads, with or without tube segments of tunnels in the wave-current environment, in the same or different directions between waves and currents, different sinking depths of tube segments of tunnels and other working conditions. The results indicated that the sinking of tube segments of tunnels had an adverse impact on the foundation trench slope, and the stability of the foundation trench slope was the worst when the tube segments of tunnels sinked to a certain position in the wave-current environment. When the waves and currents were in the same direction and descended along the slope, the slope was most prone to lose stability. Therefore, considering the influence of skining of tube segments of tunnels was helpful to improve the scientificity and accuracy of design and construction for foundation trench slopes of immersed tunnels.
- immersed tube tunnel,
- slope stability,
- strength reduction method,
- foundation trench,
- sinking of tube segments of tunnels,
- wave load

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References(16)

References

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