Investigating ground vibration induced by moving train loads on unsaturated ground using 2.5D FEM

Gao, Guanghai; Yao, Shaofeng; Yang, Jun; Juan, Chen

doi:10.1016/j.soildyn.2019.05.034

Cited by 33 publications

(20 citation statements)

References 42 publications

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“…The accuracy of the present approach was validated by comparing the simulated results obtained with the proposed 2.5D approach with the field monitoring data obtained by BANVERKET (Swedish Rail Administration). Additionally, the simulated results were compared with those from Takemiya [18] and Gao et al [21] under train speeds of 70 and Figure 1. Schematic illustration of the application of the 2.5D finite element method in dynamic responses of an embankment-ground system (Adapted with permission from ref.…”

Section: Verification Of the 25d Proceduresmentioning

confidence: 99%

“…However, some published studies have revealed that dynamic characteristics of subgrade systems subjected to mov-ing train loads will violate the corresponding assumptions in the plane strain condition, although the cross-section of the subgrade is considered invariant along the direction of the moving load. The 2.5D finite element method was introduced by Yang et al [17] for understanding the dynamic responses in subgrade systems, and it has been increasingly used with the advantages of high efficiency, high accuracy and the ability to consider complex sections [10,[17][18][19][20][21], compared with a higher demand for meshing by employing a 3D finite element model. The accuracy of simulated results obtained using the 2.5D approach depends on several factors, including the number and corresponding size of meshes, resolution in the time-frequency domain and wave adsorption boundary.…”

Section: Brief Introduction Of Basic Theorymentioning

confidence: 99%

“…The dynamic responses on each node of the mesh element in the time-space domain (x,y,z,t) can be calculated from the frequency-wavenumber domain (x,y,ξz,ω) using a dual Fourier transform. Any details on corresponding basic theories and equations can be found in the previous literature as mentioned above [17][18][19][20][21]. The present 2.5D finite element procedure was written using the commercial software MAT-LAB R2019b.…”

Section: Brief Introduction Of Basic Theorymentioning

confidence: 99%

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Effects of the Ground Reinforcement on the Dynamic Behaviors of Compacted Loess Embankment with Ballasted Track

Wei

Wang

et al. 2023

Buildings

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An embankment is needed to satisfy the requirements for the longitudinal slope of railway lines, and ground reinforcement is also generally required in loess regions. The present study attempted to understand the effects of different ground reinforcement measures on the dynamic characteristics of a track–embankment–ground system. To this end, the critical speeds and the distributions of dynamic stress and environmental vibration were analyzed using a 2.5D finite element method. Three typical ground reinforcements, including dynamic compaction ground (DCG), soil–cement compacted pile composite ground (SCG) and CFG pile composite ground (CFGG), were used. The results indicate that the train speed (critical speed I) at which the maximum vertical displacement of the track occurs is universally higher than that (critical speed II) at which the wave propagation phenomenon occurs. The lower boundary limit of the peak region in the dispersion relationship can be selected as the reference value of critical speed II. Moreover, the values of critical speed I obtained using the DCG, SCG and CFGG models were around 92, 105 and 127 m/s, respectively. For critical speed II, the values were 75, 80 and 115 m/s. Once the train speed exceeded critical speed II, the vibration was confined to the embankment in the CFGG model, as evidenced by the isolation of the wave propagation from the embankment to the ground as well as the increasing dynamic stress in the embankment. After reinforcement, the dynamic stress, dynamic influence depth (DID), critical speed and resonant frequency increased. Additionally, the DID stayed around the 3–6 m range at all speeds.

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Section: Verification Of the 25d Proceduresmentioning

confidence: 99%

Section: Brief Introduction Of Basic Theorymentioning

confidence: 99%

Section: Brief Introduction Of Basic Theorymentioning

confidence: 99%

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Effects of the Ground Reinforcement on the Dynamic Behaviors of Compacted Loess Embankment with Ballasted Track

Wei

Wang

et al. 2023

Buildings

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“…This assumption is not useful while considering track irregularities. Furthermore, a lot of FEM based parametric studies have been carried out to investigate the effect of moving load under different track and ground conditions [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Track Irregularities on the Response of Two-Way Railway Tracks

Javaid

Choi

2019

Applied Sciences

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In predicting the response of track from a moving train only one track is generally considered. However, the effect of ground vibrations from one track and its effect on the nearby tracks has not been studied completely. Therefore, in the present paper, the effect of track irregularities and speed on the prediction of two-way tracks response is investigated. For this purpose, a three-dimensional dynamic finite element (FE) model capable of simulating interactions between the train and track by using a nonlinear hertz contact method was developed. The model uses tensionless stiffness between the wheel and rail to couple them. The model components including the sleeper, ballast, and soil domain are represented by solid brick elements. The rails are modeled as 3D Euler–Bernoulli beam elements. An iterative numerical algorithm was established for the integrations of the train and track interface. A comparative analysis was performed at various speeds and rail surface irregularity wavelengths. With the increase in speed, the results showed a significant increase in the adjacent tracks response and can induce much larger track vibrations at high frequency.

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“…With regard to the propagation of vibrations, how to establish an efficient field model under different subsoil conditions has been a research topic in recent years ( 23 – 25 ). Evaporation and transpiration in different regions mean that the degree of water saturation may also be considered in the subsoil model to make the displacement of soil skeleton and excess pore water pressure more realistic, and thus make the simulation of vibration propagation more accurate ( 26 , 27 ). In the reception and transmission of vibration to the surrounding buildings, types of building structures with different operating requirements are modeled and analyzed to evaluate the overall and local vibration of sensitive locations in the building ( 28 – 30 ), in which the dynamic interaction between structural foundation and subsoil should be considered ( 31 ).…”

mentioning

confidence: 99%

On-Site Experiment and Characteristics Analysis of Ground Vibrations Induced by Vehicle Loads Moving on an Urban Trunk Road

Cao

Yanɡ

2022

Transportation Research Record: Journal of the Transportation R

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In urban areas, the ground vibrations induced by vehicle loads are becoming an increasingly serious environmental issue, especially in the planning and design of high-tech workshops. In this paper, traffic flow and ground vibrations are simultaneously measured from the vehicles moving on a trunk road in Beijing from 9:30 a.m. to 9:30 p.m. The correlation between traffic volume and ground vibration is calculated to analyze the contribution of different vehicle types and density. The characteristics of ground vibration are revealed by analyzing the experimental data from the testing points of time history and frequency variety. Moreover, the attenuation law of ground vibration is summarized and well fitted by the Bornitz model. Finally, according to existing assessment standards, the vibration levels are effectively assessed. The results indicate that the concentration of multi-peak ground vibrations in a short time period can be attributed to the combination of vibration waves induced by vehicles close to each other. Two vibration peaks were observed in the frequency range of 10 Hz to 12.5 Hz and 2.5 to 4 Hz, close to the resonant frequencies of vehicle parts. The environmental vibrations induced by road traffic may exceed the allowable values stipulated in the relevant standards, and undoubtedly influence the normal operation of precise instruments, even at a distance beyond 100 m from the source.

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Investigating ground vibration induced by moving train loads on unsaturated ground using 2.5D FEM

Cited by 33 publications

References 42 publications

Effects of the Ground Reinforcement on the Dynamic Behaviors of Compacted Loess Embankment with Ballasted Track

Effects of the Ground Reinforcement on the Dynamic Behaviors of Compacted Loess Embankment with Ballasted Track

Effect of Track Irregularities on the Response of Two-Way Railway Tracks

On-Site Experiment and Characteristics Analysis of Ground Vibrations Induced by Vehicle Loads Moving on an Urban Trunk Road

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