Effect of non-circular tunnel linings on pressure transients induced by high-speed train passes through a tunnel based on moving model test

Wang, Tiantian; Han, X.; Zhang, Lei; Qian, Bosen; Sun, Zhikun; Liu, Hongkang

doi:10.1016/j.jweia.2021.104649

Cited by 21 publications

(4 citation statements)

References 28 publications

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“…Wang et al analyzed the transient pressure characteristics of trains passing through tunnels with noncircular linings based on dynamic model experiments. Te results show that reasonable distribution of circular linings can reduce the pressure amplitude of initial compression waves [28].…”

Section: Introductionmentioning

confidence: 87%

Influence of Segmented Linings on the Micro-Pressure Wave of Tunnels

Shao

Ma³

et al. 2023

Advances in Civil Engineering

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When the tunnel has damages such as deformation and cracking, the lining structure should be set to reinforce the tunnel. In this study, a three-dimensional numerical method is performed to study the aerodynamic effects caused by the train passing through a tunnel with segmented linings at 350 km/h. The influence of the numbers, thickness, location, and types of the segmented lining structure on MPW is analyzed. The results show that the segmented linings located at the middle of the tunnel have a better mitigation effect on MPW than that of the normal linings, which increases with the segment number and the thickness of the linings. When the damage occurs near the entrance of the tunnel, a segmented lining structure with a constricted section slightly away from the tunnel entrance can be used to reduce its adverse effect on MPW.

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Section: Introductionmentioning

confidence: 87%

Influence of Segmented Linings on the Micro-Pressure Wave of Tunnels

Shao

Ma³

et al. 2023

Advances in Civil Engineering

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“…Li et al (2022) discovered a linear relationship between the residual fatigue life of a shield tunnel and the cycles of aerodynamic pressures. Furthermore, researchers have also examined the fatigue damage characteristics of high-speed trains (Lu et al , 2019; Song et al , 2015; Zhou et al , 2019) and auxiliary structures inside tunnels (Wang et al , 2021) under the loading of aerodynamic pressures. However, there is a lack of studies investigating the mechanical behavior of tunnel lining cracks subjected to ICWs.…”

Section: Introductionmentioning

confidence: 99%

Methods for calculating aerodynamics inside high-speed railway tunnel lining cracks and predicating stress intensity factors

Liu,

Deng

et al. 2023

HFF

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Purpose This study aims to propose a series of numerical and surrogate models to investigate the aerodynamic pressure inside cracks in high-speed railway tunnel linings and to predict the stress intensity factors (SIFs) at the crack tip. Design/methodology/approach A computational fluid dynamics (CFD) model is used to calculate the aerodynamic pressure exerted on two cracked surfaces. The simulation uses the viscous unsteady κ-ε turbulence model. Using this CFD model, the spatial and temporal distribution of aerodynamic pressure inside longitudinal, oblique and circumferential cracks are analyzed. The mechanism behind the pressure variation in tunnel lining cracks is revealed by the air density field. Furthermore, a response surface model (RSM) is proposed to predict the maximum SIF at the crack tip of circumferential cracks and analyze its influential parameters. Findings The initial compression wave amplifies and oscillates in cracks in tunnel linings, resulting from an increase in air density at the crack front. The maximum pressure in the circumferential crack is 2.27 and 1.76 times higher than that in the longitudinal and oblique cracks, respectively. The RSM accurately predicts the SIF at the crack tip of circumferential cracks. The SIF at the crack tip is most affected by variations in train velocities, followed by the depth and length of the cracks. Originality/value The mechanism behind the variation of aerodynamic pressure in tunnel lining cracks is revealed. In addition, a reliable surrogate model is proposed to predict the mechanical response of the crack tip under aerodynamic pressures.

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“…With the reciprocating propagation, reflection, and superposition of pressure waves, long-duration and large-amplitude pressure fluctuations are generated inside tunnels and act on the tunnel and train surface, producing alternating loads. It affects the crack initiation and propagation in the structure [1]; causes high-cycle fatigue damage to train structures [2,3], tunnel structures [4][5][6], and pressure-bearing tunnel facilities (including fire doors, control boxes, signal lights, etc.) [3,7,8]; and leads to vibration discomfort for passengers [9], threatening the safety of transportation systems [10,11].…”

Section: Introductionmentioning

confidence: 99%

General Analytical Method to Predict the Spatial–Temporal Distribution of Extreme Pressure in High-Speed Railway Tunnels in the Post-Train Stage

Li²,

Cui³

et al. 2023

Applied Sciences

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Long-duration aerodynamic pressure fluctuation in high-speed railway tunnels in the post-train stage causes fatigue damage to tunnel structures and facilities. It increases the risk of accidents and requires in-depth research. This complex phenomenon is caused by the superposition of multiple pressure waves generated successively when a train enters/leaves a tunnel. In this study, the spatial–temporal distribution of the pressure state (SDPS) model was developed, and general equations describing the transient pressure state distribution were given. Furthermore, a prediction method for extreme pressures in tunnels and a fast calculation program were proposed based on the SDPS model. The proposed model was verified using field measurements. Using the SDPS model, the worst conditions of pressure fluctuations in tunnels were analyzed. The results show that most of the maximum positive and negative pressures are symmetrical around the midpoint of the tunnel axis and appear alternately around it. When the train/wave velocity ratio M ≤ 0.8 and the train/tunnel length ratio ε ≤ 0.8, the dimensionless position of the maximum peak-to-peak pressure region was concentrated in the region of [0.33,0.67] in the tunnel, indicating the location of potential fatigue damage. The proposed model is helpful in building safe and sustainable transportation systems.

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Effect of non-circular tunnel linings on pressure transients induced by high-speed train passes through a tunnel based on moving model test

Cited by 21 publications

References 28 publications

Influence of Segmented Linings on the Micro-Pressure Wave of Tunnels

Influence of Segmented Linings on the Micro-Pressure Wave of Tunnels

Methods for calculating aerodynamics inside high-speed railway tunnel lining cracks and predicating stress intensity factors

General Analytical Method to Predict the Spatial–Temporal Distribution of Extreme Pressure in High-Speed Railway Tunnels in the Post-Train Stage

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