Improved vertical displacement calculation model for immersed tube tunnel considering tidal load

Zhou, Huanzhu; Wang, Lechen; Jiang, Binsong; Wang, Yanning

doi:10.1080/1064119x.2021.1962458

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…Given the relatively prolonged water exchange time observed in this specific area, it is advisable to adopt a pumping method as a supplementary measure to further boost construction efficiency. (6) The insights gained from this research serve as a valuable guide for selecting appropriate evaluation methods for water exchange capacity in semi-closed water areas. Whether it be in immersion tube outfitting zones, lagoons, or harbor basins, these findings provide practical suggestions and references that can inform decision-making and optimize water management strategies.…”

Section: Discussionmentioning

confidence: 98%

“…The construction period is short, and the environmental impact is small. 6 Compared with other underground transportation projects, the construction period of immersed tube tunnels is relatively short, and the construction process has a relatively small impact on the surrounding environment. Immersed tube tunnels can maximize the reduction of their negative impacts on the environment, society, and economy through optimized design and management, promoting their sustainable development.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of water exchange capacity evaluation methods for semi-enclosed water based on the outfitting zone of immersed tube tunnels

Wang,

Dong,

Yang

et al. 2024

AIP Advances

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The strength of water exchange capacity serves as a proxy for the self-purification capacity of water bodies, thereby playing a pivotal role in enhancing the overall water environment. This study focuses on the secondary outfitting area of the immersed tube tunnel within the Shenzhen–Zhongshan Link, utilizing either the substances transport model or the particle tracking model. This framework is designed to delve into the similarities, differences, and appropriateness of the Eulerian and Lagrangian methods in appraising the water exchange capacity of semi-closed water areas. The following key insights have been derived: (1) The spatial distribution patterns of water exchange capacity computed using both methods align, indicating a congruency in their fundamental principles. However, in our case study, the average water transit time determined by the Lagrangian method is 1.6 times higher than the average water residence time calculated by the Eulerian method, suggesting a more conservative approach by the Lagrangian method. (2) The results obtained from varying particle release times or initial concentration release times within a tidal cycle in the case exhibit notable disparities, highlighting the sensitivity of the system to these factors. (3) The Lagrangian method exhibits a significant 12% difference in average water transit time, compared to the mere 0.9% difference observed in the average water residence time calculated by the Eulerian method. This underscores the Lagrangian method’s heightened sensitivity to the timing of particle release. Conversely, the Eulerian method offers more stable simulation outcomes in assessing the water exchange capacity of semi-closed water bodies, making it a preferred choice for such studies. However, if a comprehensive understanding of water exchange capacity, material transport trajectories, and final destinations is sought, the Lagrangian method would be the more appropriate approach. The research outcomes presented in this paper can serve as a valuable reference for selecting appropriate evaluation techniques for water exchange capacity in semi-closed water areas, encompassing not just immersed tube outfitting zones but also lagoons and harbor basins.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Comparative study of water exchange capacity evaluation methods for semi-enclosed water based on the outfitting zone of immersed tube tunnels

Wang,

Dong,

Yang

et al. 2024

AIP Advances

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“…Liu et al (2020) proposed a new joint mechanics model, combined with the elastic foundation beam method, to calculate the vertical differential settlement of joint position caused by uneven soil layer. Zhou et al (2021) equivalent the immersed tube tunnel segment to a Timoshenko beam placed on the Vlasov two-parameter foundation, and deduced the calculation formula of the vertical deformation of the immersed tube tunnel. However, the above research does not consider the causes of settlement in essence, ignoring the characteristics of settlement changing with time and space.…”

Section: Introductionmentioning

confidence: 99%

Long-term settlement analysis of immersed tube tunnel in operation considering undisturbed clayey soil foundation

Kou,

Liang,

Wen

et al. 2024

Preprint

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The differential settlements occur in the operation of immersed tube tunnel in clayey foundation, which will cause serious problems such as tube sections cracking and leakage that threaten the operation safety of immersed tube tunnel. The settlement of immersed tube tunnel is essentially caused by the change of underwater undisturbed soil properties caused by tunnel construction disturbance and the significant time-space characteristics of soil deformation. Therefore, it is necessary to accurately quantify the influence and development law of long-term uneven settlement of immersed tube tunnel by time-spatial characteristics. A rate-dependent elastic-viscoplastic constitutive model of clayey soil considering k0 consolidation is proposed, which is programmed into FLAC3D. Then, several years of the settlement monitoring data of an immersed tube tunnel is analyzed, and the long-term settlement of the immersed tube tunnel in operation is calculated and predicted by FLAC3D. The results show that the settlement rate of immersed tube tunnel has been maintained at about 0.0015 mm/d, and the settlement tends to converge to steady state. Timely dredging and reasonable foundation treatment methods are conducive to reducing settlement during operation. The results provide a theoretical for optimizing the design of immersed tube tunnel and ensuring the safety of tunnel operation.

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“…Since the middle and late 1970s, China began to study immersed tunnels and has made substantial achievements [1][2][3][4][5][6]. Since then, immersed tunnels have made significant progress in China [7][8][9][10]. Note that immersed tunnels are widely used in cross-sea engineering with the advantages of a short construction period, high waterproof ability, and strong adaptability [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Calculation and Analysis of Pipe Joint Settlement Control in Large Back Silting Immersed Tube Tunnel

Yue

2023

Sustainability

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The use of the segmental pipe section immersed tunnel suffers from several problems, such as complex construction, weak foundation, great water depth, great thickness of siltation back on the top of the tube, and difficult settlement control. Based on Winkel’s elastic foundation beam theory, a mechanical calculation model is established according to the case of an inhomogeneous soil layer, and the force and deformation of the structural system of the immersed tube tunnel are calculated based on a bridge in Zhuhai as an example of an immersed tube tunnel. The results show that the derived formula for calculating the allowable differential settlement per unit length of the longitudinally immersed tube is applicable to the sudden change type foundation stiffness deformation model of the natural foundation section of the tube tunnel of the aforementioned bridge in Zhuhai. The relationship between the settlement control index and related influencing factors is analyzed. Hence, a formula for calculating the stratified ground foundation’s integrated bed coefficient is derived, and the equations for tunnel deflection curves and shear forces are solved. A set of calculation methods that are applicable to the foundation settlement control criteria of the segmental immersed tunnel is provided, and the results provide a significant reference for the optimization of the foundation scheme and improvement of the construction process for similar projects.

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Improved vertical displacement calculation model for immersed tube tunnel considering tidal load

Cited by 12 publications

References 35 publications

Comparative study of water exchange capacity evaluation methods for semi-enclosed water based on the outfitting zone of immersed tube tunnels

Comparative study of water exchange capacity evaluation methods for semi-enclosed water based on the outfitting zone of immersed tube tunnels

Long-term settlement analysis of immersed tube tunnel in operation considering undisturbed clayey soil foundation

Calculation and Analysis of Pipe Joint Settlement Control in Large Back Silting Immersed Tube Tunnel

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