Monitoring of train-induced responses at asphalt support layer of a high-speed ballasted track

Luo, Qiang; Fu, Hang; Liu, Kaiwen; Wang, Tengfei; Feng, Guishuai

doi:10.1016/j.conbuildmat.2021.123909

Cited by 21 publications

(4 citation statements)

References 36 publications

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“…During the field monitoring, geotechnical instrumentation was utilized after removing the ballast (Figure 5a), which involved integrated vibration sensors, strain gauges, a data acquisition unit, and a signal amplifier. The physical dimensions of the integrated vibration sensors (Type 891-II, Figure 5b) are 56 mm × 56 mm × 77 mm [13]. Although the unidirectional vibration measurement system incorporates three main functions, i.e., displacement, velocity, and acceleration, only acceleration (at all positions) and velocity (on the roadbed surface) analyses are performed in this paper.…”

Section: Instruments and Test Trainmentioning

confidence: 99%

“…Ground-and structure-borne vibrations result from moving trains and the dynamic interaction between wheels, rails, track components, and foundations [13,14]. Vibrations induced by heavy-haul trains can be influenced by several factors, such as vehicle configurations, wheel-rail contact conditions, track geometry, and the dynamic properties of the support [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Instruments and Test Trainmentioning

confidence: 99%

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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“…The field data of ballasted track of high-speed railway measured by instrumented sensors were used in this study for model verification with more details described elsewhere [ 36 ]. The high-speed railway vehicles were of the CRH380AJ-203 type, of which the configuration can be found elsewhere [ 36 ]. The running speed of the high-speed train was 295 km/h.…”

Section: Verification Of the Numerical Model Establishedmentioning

confidence: 99%

Evaluating the Effect of Rail Fastener Failure on Dynamic Responses of Train-Ballasted Track-Subgrade Coupling System for Smart Track Condition Assessment

et al. 2022

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Rail fasteners are among the key components of ballasted track of high-speed railway due to their functionality of fixing rails to sleepers. The failure of rail fastening system hinders the transmission of train loads to underlying track substructure and therefore endangers the operation safety and longevity of ballasted track. This paper first established a three-dimensional (3D) numerical model of the train-ballasted track-subgrade coupling system by integrating multibody dynamics (MBD) and finite element method (FEM). Numerical simulations were then performed to investigate the effects of different patterns of rail fastener failure (i.e., consecutive single-side, alternate single-side, and consecutive double-side) on critical dynamic responses of track structures, train running stability, and operation safety. The results show that the resulting influences of different patterns of rail fastener failure descend in the order of consecutive double-side failure, consecutive single-side failure, and alternate single-side failure. As the number of failed fasteners increases, the range where dynamic responses of track structures are influenced extends, and the failure of two consecutive single-side fasteners exerts a similar influence as that of four alternate single-side fasteners. The failure of single-side fasteners affects dynamic responses of the intact side of track structures relatively insignificantly. The influence of rail fastener failure on track structures exhibits hysteresis, thus indicating that special attention needs to be paid to locations behind failed fasteners during track inspection and maintenance. The occurrence of the failure of two or more consecutive fasteners demands timely maintenance work in order to prevent aggravated deterioration of track structures. The findings of this study could provide useful reference and guidance to smart track condition assessment and condition-based track maintenance.

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“…Asphalt pavement has many advantages compared with concrete pavement, such as installation speed, fast usability, lower maintenance costs, and high skid resistance. In recent years, researchers have also attempted to apply asphalt concrete in trackbed due to its higher vibration attenuation capacity and waterproof function [1]. With the development of construction technology and the optimization of pavement structure, many distresses in asphalt pavement (such as segregation and rutting) can be well controlled.…”

Section: Introductionmentioning

confidence: 99%

Effects of Geometry and Loading Mode on the Stress State in Asphalt Mixture Cracking Tests

Li¹,

Xuan

Rahman

et al. 2022

Materials

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Currently, a variety of asphalt mixture cracking characterization tests are available as screening tools for the better selection of high-quality raw materials and also for the optimization of mixture design for different applications. However, for a same evaluation index, using different sample geometries and loading modes might lead to obtaining different values, which prevents the application of the evaluation index as a fundamental parameter in pavement design. In this paper, the effects of geometry and loading mode on the stress state in the experimental characterization of asphalt mixture cracking were discussed using numerical simulation. The results showed that applying thermally-induced load in restrained uniaxial test configuration should be considered when performing an asphalt mixture cracking test. Compared with direct tensile configuration, compressive stress clearly existed in other common test configurations, which may prevent the initiation and propagation of cracks. Moreover, it was revealed that nonuniform stress state exists in the dog-bone geometry, which makes it possible to know the failure plane in advance and place gauges at the failure plane for measuring fundamental deformation-related properties.

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Monitoring of train-induced responses at asphalt support layer of a high-speed ballasted track

Cited by 21 publications

References 36 publications

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

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

Evaluating the Effect of Rail Fastener Failure on Dynamic Responses of Train-Ballasted Track-Subgrade Coupling System for Smart Track Condition Assessment

Effects of Geometry and Loading Mode on the Stress State in Asphalt Mixture Cracking Tests

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