Dynamic response of stabilized cinder subgrade during train passage

Wang, Tengfei; Luo, Qiang; Zhang, Liang; Xiao, Shiguo; Fu, Hang

doi:10.1016/j.conbuildmat.2020.121370

Cited by 17 publications

(2 citation statements)

References 31 publications

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“…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]. Through the sleepers, the pressure extends into the track foundation.…”

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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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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“…Considering studies on subgrade filling, Wang et al [ 14 ] studied the application of a natural cinder and fine granular soil mixture in subgrade in China. Luo et al [ 15 ] studied the consolidated undrained shear strength, failure potential, and CBR of a cinder gravel and silt mixture.…”

Section: Introductionmentioning

confidence: 99%

Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill

et al. 2021

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The application of construction waste as an aggregate in subgrade backfilling is an important recycling option. This study analyzed a subgrade backfill material consisting of lime-fly ash construction waste mixture (LFCWM). Compaction and California bearing ratio (CBR) tests were performed on LFCWM under different cement-aggregate ratios (CARs, 3:7, 4:6, 5:5, 8:2). Different normal stresses (100, 200, and 300 kPa) and aggregate sizes (20%, 40%, 60%, 80% of P4.75) were also evaluated. The experimental results indicated that: (1) when the CAR was 4:6, the optimum water content and the maximum dry density reached their maximum values of 10.1% and 2.03 g/cm3, respectively, the maximum CBR value was 42.5%, and the shear strength reached its maximum value. (2) With an increase in shear displacement, the shear stress showed a rapid initial increase, then a slow decrease, and finally tended to stabilize. (3) Normal stress had a positive effect on the shear strength of the mixture. (4) When P4.75 was 40%, the shear strength of LFCWM was the maximum. The research results have been successfully applied to road engineering, providing an important reference for the application of construction waste aggregate in roadbed engineering.

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An exploration on the degradation of hydrophobized sands as a subgrade impervious barrier during one-year outdoor weathering

Lin,

Huang,

Lourenço

et al. 2024

Acta Geotech.

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Dynamic response of stabilized cinder subgrade during train passage

Cited by 17 publications

References 31 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

Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill

An exploration on the degradation of hydrophobized sands as a subgrade impervious barrier during one-year outdoor weathering

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