Research on the deformation and settlement characteristics of tunnel lining structures under repeated loads

Wu, Fengyuan; Sheng, Wei; Zhang, Guanhua; Li, Hongnan; Ren, Yuhao; Zhang, Kexin; Wang, Chao; Sun, Tong

doi:10.1016/j.istruc.2024.106366

Structures

2024

DOI: 10.1016/j.istruc.2024.106366

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Research on the deformation and settlement characteristics of tunnel lining structures under repeated loads

Fengyuan Wu,

Wei Sheng,

Guanhua Zhang

et al.

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Cited by 2 publications

References 34 publications

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Analysis of Mechanical Properties of Steep Surrounding Rock and Failure Process with Countermeasures for Tunnel Bottom Structures

Fan,

Chen,

Yin

et al. 2024

Applied Sciences

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Steep surrounding rock significantly challenges tunnel stability by affecting the stress distribution and deformation behavior. The angle of dip in surrounding rock greatly influences these factors, heightening the risk of instability along bedding planes, particularly under high ground stress conditions. This paper presents a comprehensive analysis of steep rock strata mechanical properties based on a railway tunnel in Yunnan Province, China. It incorporates long-term field monitoring and various laboratory tests, including point load, triaxial, and loose circle tests. Using experimental data, this study simulated the failure processes of steep surrounding rock and tunnel structures with a custom finite element method (FEM) integrated with the volume of fluid (VOF) approach. The analysis summarized the deformation patterns, investigated the causes of inverted arch deformation and failure, and proposed countermeasures. The findings reveal that increasing the rock dip angle results in greater deformation and accelerated failure rates, with the surrounding rock’s loose zone stabilizing at approximately 8 m once deformation stabilizes. At a surface deformation of 8 cm, the failure zone extends to 6 m; however, this extension occurs more rapidly with higher lateral pressure coefficients. Additionally, failure zones develop more quickly in thin, soft rock on steep slopes compared to uniform rock formations. The rise of the tunnel floor is attributed to the steeply inclined, thin surrounding rock. To enhance bottom structure stiffness, this study recommends incorporating an inverted arch structure and increasing both the number and strength of the anchor bolts.

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Analysis of Mechanical Properties of Steep Surrounding Rock and Failure Process with Countermeasures for Tunnel Bottom Structures

Fan,

Chen,

Yin

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

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Research on the Full Life Cycle Deformation, Stress Response, and Dynamic Fatigue Performance of Concrete Structures in Pump Stations

Yuan,

Zhu,

Han

et al. 2024

Buildings

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Concrete structures are subjected to static and fatigue loads during long-term service, and temperature changes can cause changes in the volume of concrete, leading to stress changes and fatigue damage, which affect the mechanical properties and service life of a structure. In response to the current lack of three-dimensional analysis and the exploration of the mechanical behavior and damage evolution processes of concrete structures under variable temperature environmental conditions, this paper relies on the Fenghuangjing Pump Station project involving the Yangtze River and Huaihe River and constructs a concrete thermo-mechanical-fatigue-damage model based on the power exponent function damage constitutive model. By using multiple coupled simulation calculations to predict the performance of concrete structures; analyzing the stress, deformation, and fatigue damage of structures from construction to operation; comparing measured data; dynamically optimizing inversion to obtain concrete thermal parameters; proposing key control parameters; and warning indicators and thresholds, the research results can provide reference for the long-term safe operation of similar projects.

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Research on the deformation and settlement characteristics of tunnel lining structures under repeated loads

Cited by 2 publications

References 34 publications

Analysis of Mechanical Properties of Steep Surrounding Rock and Failure Process with Countermeasures for Tunnel Bottom Structures

Analysis of Mechanical Properties of Steep Surrounding Rock and Failure Process with Countermeasures for Tunnel Bottom Structures

Research on the Full Life Cycle Deformation, Stress Response, and Dynamic Fatigue Performance of Concrete Structures in Pump Stations

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