Macro–meso mechanical properties of ballast bed during three-sleeper tamping operation

Zhang, Zhihai; Xiao, H.; Zhu, Yajie; Gan, Tiancheng; Nadakatti, Mahantesh M.; Hufei,

doi:10.1080/23248378.2022.2129493

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…Thus, if the stabilizing operation is conducted immediately after the tamping operation, the lateral resistance of the ballast bed can be increased by 16.7 %. The above results are consistent with some conclusions of literature [14,26], which indicate that tamping operation can reduce the lateral resistance of the ballast bed. A similar trend can be found in the changes of the lateral resistance work.…”

Section: Ballast Bed Resistance Characteristicssupporting

confidence: 93%

“…The results show that the asymmetric ballast bed support state can increase the vibration characteristics of sleepers. Zhang et al [26] established a simulation model of three-sleeper tamping operation considering the characteristics of ballast resistance, and analyzed the influence of tamping operation on the resistance and compactness of ballast bed. The results show that the three-sleeper tamping operation can reduce the lateral resistance of ballast bed by 50.50 %, the lateral resistance work by 50.04 %, and the compactness of ballast bed in the crib area is greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Xiao

Zhang

Zhu

et al. 2023

Construction and Building Materials

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Section: Ballast Bed Resistance Characteristicssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Xiao

Zhang

Zhu

et al. 2023

Construction and Building Materials

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Ballast Settlement Accumulation in Zones with Unsupported Sleepers

Nabochenko,

Sysyn,

Fischer

2024

Transp. Infrastruct. Geotech.

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The high influence of impact and vibration on the behavior of crushed stone and ballast materials has been known for a long time. The zones with unsupported sleepers, which are always present in transition zones, crossings, welds, etc., are typically characterized by impact interaction, ballast full unloading, and additional preloading. However, no studies on ballast layer settlements consider impact vibration loading. Moreover, the influence of the cyclic loading on the ballast settlement intensity is considered ambiguously, with both decelerating and accelerating trends. The comprehensive literature review presents the influence of factors on settlement intensity. The present study aims to estimate the long-term processes of sleeper settlement accumulation depending on the loading factors: impact, cyclic loading, and preloading. The typical for a void zone ballast loading pattern was determined for various void sizes and the position along the track by using a model of vehicle-track interaction that was validated by experimental measurements. The loading patterns were parametrized with four parameters: maxima of the cyclic loading, impact loading, sleeper acceleration, and minimal preloading. A specially prepared DEM simulation model was used to estimate the ballast settlement intensity after initial settlement stabilization for more than 100 loading patterns of the void zone cases. The settlement simulation results clearly show that even a low-impact loading pattern causes many times increased settlement intensity than ordinary cyclic loading. Moreover, the initial preloading in the neighbor-to-void zones can cause even a decrease in the settlement intensity compared to the full ordinary or partial unloading. A statistical analysis using a machine learning approach and an analytic one was used to create the model for the intensity prediction regarding the loading patterns. The analytic approach demonstrates somewhat lower prediction quality, but it allows to receive plausible and simple analytic equations of the settlement intensity. The results show that the maximal cyclic loading has a nonlinear influence on the settlement intensity that corresponds to the 3–4 power function, and the impact loading is expressed by the linear to parabolic function. The ballast’s minimal preloading contributes to the reduction of the settlement intensity, especially for high cyclic loadings that are typical for neighbor-to-void zones. The results of the present study could be used for the complementing of the present phenomenological equations with the new factors and further application in the algorithms of the settlements accumulation prediction.

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Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track

Chi,

Xiao,

Wang

et al. 2024

Railw. Eng. Sci.

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Laying the under-sleeper pad (USP) is one of the effective measures commonly used to delay ballast degradation and reduce maintenance workload. To explore the impact of application of the USP on the dynamic and static mechanical behavior of the ballast track in the heavy-haul railway system, numerical simulation models of the ballast bed with USP and without USP are presented in this paper by using the discrete element method (DEM)—multi-flexible body dynamic (MFBD) coupling analysis method. The ballast bed support stiffness test and dynamic displacement tests were carried out on the actual operation of a heavy-haul railway line to verify the validity of the models. The results show that using the USP results in a 43.01% reduction in the ballast bed support stiffness and achieves a more uniform distribution of track loads on the sleepers. It effectively reduces the load borne by the sleeper directly under the wheel load, with a 7.89% reduction in the pressure on the sleeper. Furthermore, the laying of the USP changes the lateral resistance sharing ratio of the ballast bed, significantly reducing the stress level of the ballast bed under train loads, with an average stress reduction of 42.19 kPa. It also reduces the plastic displacement of ballast particles and lowers the peak value of rotational angular velocity by about 50% to 70%, which is conducive to slowing down ballast bed settlement deformation and reducing maintenance costs. In summary, laying the USP has a potential value in enhancing the stability and extending the lifespan of the ballast bed in heavy-haul railway systems.

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Macro–meso mechanical properties of ballast bed during three-sleeper tamping operation

Cited by 8 publications

References 35 publications

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Ballast Settlement Accumulation in Zones with Unsupported Sleepers

Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track

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