Finite element model of ballasted railway with infinite boundaries considering effects of moving train loads and Rayleigh waves

Li, Ling; Nimbalkar, Sanjay; Zhong, Rui

doi:10.1016/j.soildyn.2018.06.033

Cited by 63 publications

(24 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to study these spectral characteristics, we performed a numerical study of the seismic wavefield radiated by a typical freight train found in California being 1 km long (Ltrain), moving at 25 m/s (90 km/hr, Vtrain) and composed of cars of 16 m long (L). We again consider that the radiated seismic energy is dominated by a dynamic loading/unloading effect that can be represented as a moving vertical force applied by each wheel on the ballast (L. Li et al, ). We model the train load as discretized vertical forces.…”

Section: Equivalent Magnitude and Spectral Characteristics Of Train‐rsupporting

confidence: 91%

“…The elastic energy radiated to the ground by vehicles and trains is dominated by a dynamic loading/unloading effect that can be represented as a moving vertical force at each contact point between the vehicle and the ground (L. Li et al, ). For earthquakes, the potency P 0 represents the product of slip on a fault ( u ) and the rupture area ( A ) (Ben‐Zion , ).…”

Section: Equivalent Magnitude and Spectral Characteristics Of Train‐rmentioning

confidence: 99%

See 1 more Smart Citation

Train Traffic as a Powerful Noise Source for Monitoring Active Faults With Seismic Interferometry

Brenguier

Boué

Ben‐Zion

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

Laboratory experiments report that detectable seismic velocity changes should occur in the vicinity of fault zones prior to earthquakes. However, operating permanent active seismic sources to monitor natural faults at seismogenic depth is found to be nearly impossible to achieve. We show that seismic noise generated by vehicle traffic, and especially heavy freight trains, can be turned into a powerful repetitive seismic source to continuously probe the Earth's crust at a few kilometers depth. Results of an exploratory seismic experiment in Southern California demonstrate that correlations of train‐generated seismic signals allow daily reconstruction of direct P body waves probing the San Jacinto Fault down to 4‐km depth. This new approach may facilitate monitoring most of the San Andreas Fault system using the railway and highway network of California.

show abstract

Section: Equivalent Magnitude and Spectral Characteristics Of Train‐rsupporting

confidence: 91%

Section: Equivalent Magnitude and Spectral Characteristics Of Train‐rmentioning

confidence: 99%

Train Traffic as a Powerful Noise Source for Monitoring Active Faults With Seismic Interferometry

Brenguier

Boué

Ben‐Zion

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…The rail, ladder sleeper, steel pipes, ballast and soil were simulated by finite elements and the fasteners were simulated by Kelvin's elements. To avoid the wave reflection at the boundaries in the dynamic analysis, the infinite element boundary [26,27] and perfect matched layer (PML) [28] were used. Considering the convenience of the model building, the infinite element boundary was chosen in this numerical model.…”

Section: Fe-ife Track-soil Modelmentioning

confidence: 99%

Analysis of the Vibration Mitigation Characteristics of the Ballasted Ladder Track with Elastic Elements

et al. 2019

Sustainability

View full text Add to dashboard Cite

Despite the fact railways are seen as an environmentally friendly and sustainable form of transport, however, the train-induced vibration has been seen as a negative environmental consequence. The ballasted ladder track is one type of ballasted track with longitudinal sleepers. The elastic elements can not only protect the track structure but also control the vibration. To investigate the vibration mitigation effects of ballasted ladder track with elastic elements, a finite element - infinite element (FE-IFE) model was built considering the elastic elements of under-sleeper pads (USPs) and under-ballast mats (UBMs). This model was validated by a laboratory test. Then, the moving train load was obtained based on the multi-body dynamics (MBD)-finite elements method (FEM) analysis. The vibration mitigation effects of the ballasted ladder track with different types of elastic elements were calculated compared with the ballasted tracks without elastic elements. The results indicate that: (1) the ballasted ladder track has the advantage of vibration reduction at low frequencies, with a maximum vibration attenuation of 25.2 dB and an averaged vibration attenuation of 19.0 dB between 5 and 20 Hz through the ballast. (2) The ballasted ladder track with USPs or UBMs can provide better vibration attenuation between 30 and 100 Hz, but it induces a vibration amplification between 5 and 30 Hz. (3) The ballasted ladder track with elastic elements in different cases can provide different vibration mitigation effects. The ballasted ladder track with both USPs and UBMs can provide the best mitigation effect with an average vibration mitigation of approximately 15 dB and a maximum vibration mitigation of 30 dB between 30 and 100 Hz.

show abstract

“…The discrete element models are usually applied to capture the particle-scale mechanism and interface behavior using geosynthetics (Han et al, 2011;Tutumluer et al, 2012;Ngo et al, 2017;Gao and Meguid, 2018). However, these models are not able to capture the overall track response (Li et al, 2018). A generally accepted method or standard for the design or renewal of railway tracks with geogrids is lacking.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of Ballasted Rail Track Capturing Effects of Geosynthetic Inclusions

Jiang

Nimbalkar

2019

Front. Built Environ.

Self Cite

View full text Add to dashboard Cite

This paper presents a two dimensional finite element (FE) approach to investigating beneficial aspects of geogrids in the railway track. The influences of different factors including the subgrade strength, the geogrid stiffness, the placement depth of geogrid, the effective width of geogrid, the strength of ballast-geogrid interface and the combination of double geogrid layers were investigated under the monotonic loading. The results indicated the role of geogrid reinforcement is more pronounced over the weak compressible subgrade. A stiffer geogrid reduces ballast settlement and produces a more uniform stress distribution along a track. The placement location of a geogrid is suggested at the ballast-sub-ballast interface to achieve better reinforcement results. Although the width of a geogrid layer should be sufficient to cover an entire loaded area, excessive width does not guarantee additional benefits. Higher interface strength between a ballast and a geogrid is beneficial for effective reinforcement. Increasing the number of geogrid layers is an effective way to reinforce the ballast over weak subgrades. The results of the limited cyclic FE simulations revealed the consistency of the reinforcement effect of the geogrids under monotonic and cyclic loads.

show abstract

Finite element model of ballasted railway with infinite boundaries considering effects of moving train loads and Rayleigh waves

Cited by 63 publications

References 20 publications

Train Traffic as a Powerful Noise Source for Monitoring Active Faults With Seismic Interferometry

Train Traffic as a Powerful Noise Source for Monitoring Active Faults With Seismic Interferometry

Analysis of the Vibration Mitigation Characteristics of the Ballasted Ladder Track with Elastic Elements

Finite Element Modeling of Ballasted Rail Track Capturing Effects of Geosynthetic Inclusions

Contact Info

Product

Resources

About