Tunnel Bottom Cavity Laws of Heavy-Haul Railway Tunnel under Train Load and Groundwater in Weak Surrounding Rock Condition

Zi-qiang, LI; Li, Zheng; Huang, Weiwei; Xu, Zhifan; Zhang, Wengang; Chen, Kunping

doi:10.1007/s12205-021-5953-y

Cited by 6 publications

(7 citation statements)

References 10 publications

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Section: Variation Regularity Of Tunnel Cumulative Damagesupporting

confidence: 90%

“…The reason for this phenomenon is that the damage of the lower lining of the tunnel is caused by multiple factors such as the upper soil pressure, which belongs to the normal range and can be ignored. It can be concluded from Figure 5 that lining damage mainly occurs at the arch foot under train load, which is consistent with the research conclusions of other scholars [16,17]. The variation rule of accumulated damage at each analyzed position of the tunnel is shown in Figure 6 when the buried depth of the tunnel is 15 m. The damage at position 2 also increased the fastest.…”

Section: Variation Regularity Of Tunnel Cumulative Damagesupporting

confidence: 88%

“…Combined with the empirical equation, the cumulative plastic strain of the foundation and the long-term settlement of the tunnel were obtained. Li et al [17] studied that under the combined influence of heavy-haul trains and groundwater, the surrounding rock particles gradually become loose under the dynamic influence of heavy-haul trains due to the void mechanism of surrounding rock at the bottom of tunnel. This is particularly obvious in the defective location of weak surrounding rock, at the same time, the increase in axle load and deterioration of surrounding rock condition will aggravate the situation of the tunnel bottom cavity.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Study on Lining Damage of Shield Tunnel under Train Load

Wang¹,

Shao²,

Li³

et al. 2022

Sustainability

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Under the long-term dynamic load influence of trains, shield tunnel structures are damaged. With the increase in operating number, cumulative damage gradually increases. When cumulative damage increases to a certain value, the tunnel lining produces cracks and loses tensile strength, which leads to tunnel deformation, damage, etc. In serious cases, the tunnel ceases operation, causing traffic accidents and casualties. Based on the finite element software ABAQUS, this paper analyses the change rule of tunnel lining damage under long-term dynamic train load and explores the influence of tunnel buried depth on the change rule of tunnel lining damage. The excitation force function is used to generate a series of dynamic and static loads superimposed by sine functions to simulate the dynamic loads of trains. Load is applied above the tunnel by writing DLOAD subprogram. The results show that the damage of tunnel lining mainly occurs at the arch foot and the structural damage in other places can be neglected. Under the same loading condition, the greater the tunnel lining damage is. Under the same loading conditions, the tunnel lining damage increases with the increase in buried depth. According to the test results, the mathematical expressions of cumulative damage value versus loading times at the location prone to fatigue damage. It provides theoretical reference for safety evaluation and protection of tunnel structure under long-term train load.

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Section: Variation Regularity Of Tunnel Cumulative Damagesupporting

confidence: 90%

Section: Variation Regularity Of Tunnel Cumulative Damagesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation Study on Lining Damage of Shield Tunnel under Train Load

Wang¹,

Shao²,

Li³

et al. 2022

Sustainability

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“…The influence of initial pressure, supporting force of the tunnel, and radius of the tunnel on stress and displacement around the tunnel is analyzed by the proposed solution. Taking the Muzhailin tunnel as an example, variable models for the mechanical parameters of surrounding rock are based on experimental results from the Muzhailin tunnel in Table 2 (Li Z et al, 2021). The Muzhailing tunnel is a typical soft rock tunnel under high geostress conditions and belongs to the Lanzhou-Chongqing Railway in China.…”

Section: Analysis Of Influencing Factorsmentioning

confidence: 99%

Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

et al. 2023

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The accurate understanding of the influence of confining pressure on the mechanical characteristics of soft rock and how to comprehensively consider this influence in the elastoplastic analysis of tunnels are the fundamental premises for the effective evaluation of the deformation control and stability of soft rock tunnels. Therefore, this paper firstly investigates the effect of confining pressure on the deformation and strength characteristics of phyllite and slate, using triaxial experiment results and proposed variable models for the mechanical parameters (E, v, c, φ) of soft rock with confining pressure variation. Secondly, according to the second stress state around tunnels and these variable models for the mechanical parameters of soft rock, a new elastoplastic solution for tunnels is devised, which simultaneously considers the effect of confining pressure on the deformation and strength characteristics of the surrounding rock. Finally, with the proposed elastoplastic solution, the effect of multiple factors (initial pressure, supporting force, and tunnel radius) on the stress and displacement of tunnel surrounding rock is analyzed.

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“…Wang et al [10] compared and analyzed the dynamic response and fatigue life of a tunnel base structure with water and without water through on-site monitoring and numerical simulation, revealing the adverse effects of water damage on the tunnel structure. Li et al [11] analyzed the degradation range and depth of the surrounding rock at the bottom of a heavy-duty railway tunnel with different axle loads and the surrounding rock conditions by combining the method of laboratory testing and discrete element simulation, and they obtained 20 cm as the maximum degradation depth of the surrounding rock. Andersen et al [12] tried to compare the response differences between the 2D model and the 3D model and concluded that the 3D model is more accurate for the absolute prediction of train-induced vibration, while the 2D model is only qualitatively feasible.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response and Service Life of Tunnel Bottom Structure Considering Hydro-Mechanical Coupling Effect under the Condition of Bedrock Softening

Wang

Luo

et al. 2022

Materials

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Due to the long-term coupling effect of a train load and groundwater, the surrounding rock at the tunnel bottom will soften in a certain range and the mechanical parameters of the surrounding rock will decrease, causing the uneven distribution of the confining pressure at the tunnel bottom and affecting the base concrete structure service life. In this research, the method of combining field tests and numerical simulation is adopted, and the vertical displacement, vertical acceleration, and maximum and minimum principal stresses are used as evaluation indicators. The dynamic response law of the base structure with the softened surrounding rock of the heavy-duty train is analyzed, and the Miner linear cumulative damage theory is introduced to obtain the service life of the tunnel bottom structure under different softening conditions. The results show that with the decrease in the softening coefficient and the increase in the softening thickness of the bedrock, the displacement, acceleration, and principal stress response indexes of the structure increase by varying degrees, and the service life of the base structure decreases almost linearly. The maximum vertical displacement, acceleration, and tensile stress are located directly below the track, and the maximum compressive stress is located at the connection between the inverted arch and the side wall. According to the predicted value of the service life, the reliability of the base structure is divided into four levels: safety, warning, danger, and serious danger.

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Tunnel Bottom Cavity Laws of Heavy-Haul Railway Tunnel under Train Load and Groundwater in Weak Surrounding Rock Condition

Cited by 6 publications

References 10 publications

Numerical Simulation Study on Lining Damage of Shield Tunnel under Train Load

Numerical Simulation Study on Lining Damage of Shield Tunnel under Train Load

Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

Dynamic Response and Service Life of Tunnel Bottom Structure Considering Hydro-Mechanical Coupling Effect under the Condition of Bedrock Softening

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