Propagation characteristics of vibrations induced by heavy-haul trains in a loess area of the North China Plains

Dong, Junchen; Yang, Yong; Wu, Zhihui

doi:10.1177/1077546318802980

Cited by 13 publications

(8 citation statements)

References 26 publications

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“…Consequently, the thickness of the top and bottom layers considered in the existing HAL railway network can likely satisfy the requirements to realize a heavy-haul train with a certain v and F within the available zone (see gray zone of Figure 13); however, the operation of HAL trains with v and F outside the available zone cannot be realized unless the top and bottom layers are reinforced. It should be noted that the operation of HAL trains with different v and F for the existing railway lines [7,25,37,38] lies in the predicted available zone (see Figure 13), which demonstrates that the proposed service performance evaluation method is valid and accurate. where σ0 is a model parameter, and f(v) and f(F) depend on v and F, respectively.…”

Section: Evaluation Of Service Performancementioning

confidence: 89%

Evaluating the Service Performance of Heavy Axle Load Ballasted Railway by Using Numerical Simulation Method

Tian

Ling

et al. 2022

Applied Sciences

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To evaluate the service performance of the track substructure of heavy axle load (HAL) railway transportation, an inverse analysis was performed to estimate the resilient modulus values of the track substructure, based on the deflection data obtained from light falling weight deflectometer testing. Subsequently, a three-dimensional finite element model was developed to simulate the effect of the train speeds (v) and axle loads (F) on the typical dynamic responses in the railway track system. The results convincingly indicated that increasing v or F can amplify the track vibration. Finally, a critical stress ratio method was adopted to evaluate the service performance based on the numerical results. A recommended range of v and F was determined to maintain the long-term stability of the HAL railway line. The findings can provide guidance for designing the track and maintenance plans to avoid track support failures and ensure track infrastructure resiliency.

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Section: Evaluation Of Service Performancementioning

confidence: 89%

Evaluating the Service Performance of Heavy Axle Load Ballasted Railway by Using Numerical Simulation Method

Tian

Ling

et al. 2022

Applied Sciences

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“…There are numerical models that simulate the wheel and rail contact using nonlinear methods (Antolin et al, 2013; Dong et al, 2019; Ju, 2014; Xu and Zhai, 2018). This study modified two frictional wheel/rail contact elements (Ju, 2016) and the rigid body theory to a wheel/rail axis element, which can be used with the rigid link and lumped mass to generate a full train finite element model and combined it with the bridge and rail finite element mesh to analyze the derailment of trains moving on bridges.…”

Section: Moving Wheel/rail Axis Elementmentioning

confidence: 99%

Derailment of trains moving on lead rubber bearing bridges under seismic loads

2020

Journal of Vibration and Control

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This study investigates the derailment of trains moving on bridges with lead rubber bearings. A moving wheel/rail axis element that couples two wheels and rails together is first developed to generate a train finite element model with 12 cars, while the sliding, sticking, and separation modes of the wheels and rails are accurately simulated. The finite element results indicate that the base shear of the bridge with lead rubber bearings is much smaller than that without lead rubber bearings. Similar to the base shear, the train derailment coefficients for the bridge with lead rubber bearings are much smaller than those without lead rubber bearings because yield lead rubber bearings during large seismic loads can change the bridge natural frequency to avoid resonance. For earthquakes with a very long dominant period, the lead rubber bearing effect to reduce the train derailment may not be obvious because the natural period of the bridge due to the full yield of lead rubber bearings can approach the dominant period of the earthquake.

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“…Vibrations from moving trains are transmitted through the railway track superstructure to the foundation, which comprises mainly nonhomogeneous materials (ballast and soil). Such media exhibit different properties between layers that determine the features of elastic wave propagation [22][23][24]. The vibro-impacts received from the rolling stock result in track structure deformation and subgrade stress.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

Feng,

Luo,

Lyu

et al. 2023

Sustainability

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Retaining walls are structures used to retain earth materials on a slope. Typically, they are designed for static loads, but for highway and railway infrastructures, vehicle-induced dynamic responses are also relevant. Therefore, retaining wall structures are often designed with a factor of safety that is higher than necessary, because it can be challenging to quantify the magnitude of expected dynamic stresses during the design stage. This unnecessary increase in material usage reduces the sustainability of the infrastructures. To improve railway retaining wall sustainability, this paper presents the results from a field monitoring campaign on a heavy-haul rail line with a retaining wall, studying the dynamics induced in response to 30-ton axle load trains running at speeds of between 5 km/h and 100 km/h. The site comprises an earth embankment supported by a gravity retaining wall, with accelerometers on the sleepers, roadbed surface, and retaining wall, velocity sensors on the roadbed, and strain gauges on the rail web to record wheel–rail forces. The vibration intensities collected from various locations are processed to explore the peak particle velocities, maximum transient vibration values, and one-third octave band spectrums. Two transfer functions define the vibration transmission characteristics and attenuation of vibration amplitude along the propagation path. The long-term dynamic stability of the track formation is studied using dynamic shear strain derived from the effective velocity. The peaks of observed contact forces and vibrations are statistically analyzed to assess the impact of train speed on the dynamic behavior of the infrastructure system. Next, a 3D numerical model expresses the maximum stress and displacements on the roadbed surface as a function of train speed. The model evaluates the earth pressures at rest and vehicle-induced additional earth pressures and horizontal wall movement. The investigation provides new insights into the behavior of railway track retaining walls under train loading, and the field data are freely available for other researchers to download. The findings could facilitate the design of more sustainable retaining walls in the future.

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Propagation characteristics of vibrations induced by heavy-haul trains in a loess area of the North China Plains

Cited by 13 publications

References 26 publications

Evaluating the Service Performance of Heavy Axle Load Ballasted Railway by Using Numerical Simulation Method

Evaluating the Service Performance of Heavy Axle Load Ballasted Railway by Using Numerical Simulation Method

Derailment of trains moving on lead rubber bearing bridges under seismic loads

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

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