Vibration of subgrade and evaluation of derailment coefficient of train under combined earthquake- moving train load

Meng, Guang; Xu, X.; He, Rui; Chen, Q.S.; Li, D.Y.

doi:10.1016/j.sandf.2020.12.005

Cited by 11 publications

(2 citation statements)

References 27 publications

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“…Additionally, the maximum lateral forces on the left and right tracks are 1.71 kN and 1.79 kN, respectively, at 120 km/h, showing increases of 8.23% and 16.9% compared to those at 80 km/h. Furthermore, by comparing these response values with the previously mentioned electrified railway operational safety verification standards, all obtained values are within the specified limits [25,26].…”

Section: Different Driving Speedsmentioning

confidence: 66%

Dynamic Response Study of Overhead Contact System Portal Structure Based on Vehicle–Track–Bridge Coupled Vibration

Li,

Zhao

2024

Energies

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In light of the rapid development of electrified railways, the safety and stability of train operations, as well as the catenary’s interaction with current quality, have garnered widespread attention. Electrified train operation with additional track irregularities serves as a principal excitation source within the vehicle–bridge–catenary system, significantly influencing the vibration characteristics of the system. Addressing the aforementioned issues, we first established the vehicle–track dynamics model and the bridge–catenary finite element model based on the principles of coupled dynamics of the vehicle–track system. These models are interconnected using dynamic forces between the wheel and rail. Subsequently, within the vehicle–track coupled system, track random irregularities are introduced as input excitations for the coupled model, and the dynamic response of the system is simulated and solved. Then, the obtained wheel–rail forces are applied to the bridge–catenary coupled system finite element model in the form of time-varying moving load forces. Finally, the dynamic response characteristics of the catenary portal structure under different conditions are determined. Meanwhile, a study on the vibration characteristics of the truss-type pillar portal structure was conducted, and the results were compared with those of existing models. The results indicate that the vertical and lateral forces between the vehicle and track are positively correlated with the speed and irregularity amplitude. Response values such as the derailment coefficient and wheel load reduction rate are within the specified range of relevant standards. The low-order natural resonant frequency of the truss-type pillar structure has, on average, increased by 0.86 compared to the existing pillar structure, which signifies improved stability. Furthermore, under various conditions, the average reductions in maximum displacement and stress response of this pillar structure are 13.2% and 14.19%, respectively, in comparison to the existing pillar structure, rendering it more suitable for practical engineering applications.

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Section: Different Driving Speedsmentioning

confidence: 66%

Dynamic Response Study of Overhead Contact System Portal Structure Based on Vehicle–Track–Bridge Coupled Vibration

Li,

Zhao

2024

Energies

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“…To solve the problems existing in current rail transportation, many scholars have collected field data for different subway operating conditions. Gao et al [2] compared the vibration acceleration values of the Qingdao Metro rock foundation and Shanghai Metro soft soil foundation through testing and conducted time and frequency domain analysis on the test data. They concluded that there is an inverse correlation between the medium damping size and the foundation vibration size.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Soil Differences in Subway Vibration Transmission Paths

Li,

Yang,

Zhang

et al. 2024

Buildings

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Current challenges in collecting and analyzing subway vibration data include the absence of standardized data collection methods, limitations in data analysis techniques, and an unclear understanding of the effects of geological conditions on vibrations. This study investigated vertical vibrations of tunnel walls and the ground above tunnels under different geological conditions of soft soil and rock strata at horizontal distances of 0, 15 m, and 30 m from the tunnel center line during train passages. The collected data underwent Fourier transformation and 1/3 octave processing to extract spectral characteristics and analyze transmission losses across different frequency bands. Our findings revealed two vibration peaks in the transmission process for both soft soil and rock formation geology. Specifically, high-frequency vibrations in soft soil experienced greater attenuation when transmitted from the tunnel wall to the ground at 0 m, while low-frequency vibrations in rock formations showed greater attenuation. We also observed a vibration amplification phenomenon at 15 m under soft soil geology conditions. Although low-frequency vibrations below 12.5 Hz showed slight attenuation within a 30 m test distance under both geological conditions, vibrations above 40 Hz experienced significant attenuation. These results offer valuable insights for reducing vibrations in subway superstructures and planning subway lines under diverse geological conditions. Furthermore, this study serves not only as a basis for mitigating vibrations in metro spans and designing metro lines in various geological contexts but also establishes a scientific foundation for future research.

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The Role of Retaining Walls in Trackbed Deflection—A Numerical Analysis of Railway Slab Tracks

Lyu,

Luo,

Wang

et al. 2024

Lecture Notes in Civil Engineering

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Vibration of subgrade and evaluation of derailment coefficient of train under combined earthquake- moving train load

Cited by 11 publications

References 27 publications

Dynamic Response Study of Overhead Contact System Portal Structure Based on Vehicle–Track–Bridge Coupled Vibration

Dynamic Response Study of Overhead Contact System Portal Structure Based on Vehicle–Track–Bridge Coupled Vibration

Analysis of Soil Differences in Subway Vibration Transmission Paths

The Role of Retaining Walls in Trackbed Deflection—A Numerical Analysis of Railway Slab Tracks

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