Full-scale multi-functional test platform for investigating mechanical performance of track–subgrade systems of high-speed railways

Zhai, Wanming; Wang, Kaiyun; Chen, Zhaowei; Zhu, Shengyang; Cai, Chao; Liu, Gang

doi:10.1007/s40534-020-00221-y

Cited by 46 publications

(8 citation statements)

References 25 publications

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“…However, due to the limits of the experimental facilities and cost, there is still a lack of the full-scale test regarding the interfacial damage of CRTS II SBTS caused by the vertical wheel impact. ere once was a wheel-drop test of CRTS II SBTS, in which, however, only the acceleration of the track slab was recorded [26]. e development of the interfacial damage was not observed due to technical difficulty.…”

Section: Discussionmentioning

confidence: 99%

Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact

Liu

Sun

et al. 2021

Shock and Vibration

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During the running of a high-speed train, the wheel may bounce on the rail due to the track irregularity. The wheel bounce could generate a vertical impact, leading to the initiation and expansion of delamination between layers of the track structure. In this paper, the evolution of the interfacial damage and delamination subjected to the vertical impact is simulated using finite element analysis (FEA). In the FEA, a bilinear cohesive zone model (CZM) is adopted to simulate the interface between the track slab and the CA mortar layer. For different levels of impact energy, the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination are calculated and compared. The effects of the tangential and normal stiffness of the interface on the distribution of interfacial damage and delamination are investigated. The results show that the contact force, vertical deformation, absorbed energy, area of interfacial damage, and area of delamination increase with the increase of the impact energy. The area of interfacial damage in the compression stage is closely related to the tangential stiffness, whereas the area of delamination depends on the normal stiffness. The normal stiffness that gives the largest area of delamination is recommended to be taken as the lower bound of the normal stiffness for both controlling the delamination and preventing an exceedance of the track irregularity limit.

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Section: Discussionmentioning

confidence: 99%

Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact

Liu

Sun

et al. 2021

Shock and Vibration

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“…Zhang et al [ 15 ] reported a real-size laboratory test of a double-block ballastless track–subgrade system with emphasis on investigating the dynamic performance evolution. In addition, extensive field tests on investigating the dynamic responses of the railway track–subgrade structure and the ground during train operation have been conducted in some studies [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], but it is not always practicable, since this method is time-consuming, high-cost, and may interrupt train operations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics of Railway Subgrade Using a Newly-Developed Prestressed Reinforcement Structure: Case Study of a Model Test

et al. 2022

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Poor subgrade conditions usually induce various subgrade diseases in railways, leading to some adverse influences. An innovative technology that involves installing a prestressed reinforcement structure (PRS) that consists of steel bars and lateral pressure plates (LPP) for subgrade was introduced to improve its stress field and provide compulsive lateral deformation constraints for slope. In this study, an investigation into the dynamic acceleration responses of railway subgrade strengthened according to different PRS schemes was presented using a 1:5 scale model test, aiming to explore the effects of the axle load, the reinforcement pressure, and the loading cycles on the acceleration characteristics of the subgrade. The experimental results showed that (1) after pretension of the steel bar, prestress loss occurred due to the soil creep behavior and group anchor effect, so a moderate amount of over-tension in practices would be necessary; (2) a distinctive periodical behavior of subgrade subjected to the cyclic loads was observed, the horizontal accelerations were generally less than the vertical accelerations at the same measurement heights, and the vibration energy attenuated gradually from the shoulder to the toe along the slope; (3) in the short-term tests, the peak accelerations at all measurement points had a linear correlation with the axle load, and oppositely, it showed an approximately linear decrease with the increasing reinforcement pressure; And (4) in the long-term tests, to simulate the heavy haul wagon with a 35 t axle load, the variation in the effective acceleration with loading cycles under reinforcement pressure 100 kPa initially exhibited a decrease and subsequently tended to be stable, which is apparently less than that without reinforcement pressure. Consequently, it was demonstrated that the PRS itself and increasing reinforcement pressure can effectively mitigate the subgrade vibration, and provide an appropriate alternative to improve the dynamic performance of railway subgrade under the moving train loads.

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“…Extensive research has been conducted using a systematic approach to investigate the dynamics problems with the train-track-bridge dynamic interaction theory. 5,6,12,[14][15][16][17][18][19][20] By combining each subsystem model and the interaction model between subsystems of the train-track-bridge system into a whole model, the influences of various excitations can be considered or specially studied. [21][22][23][24] For the issues of bridge deformation effects on ballastless tracks, the bridge types investigated are mainly simply-supported girder bridges, continuous girder bridges, and arch bridges.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic effects of train-track-bridge system subject to environment-induced deformation of long-span railway bridge

Han

Zhu

Zhai

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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Laying ballastless tracks on a long-span railway bridge with a main span greater than 300 m is a challenge in engineering practice and has aroused significant concerns. Influenced by complicated environmental factors, long-span railway bridges in service deform with large amplitudes and complex shapes, which may result in damage to the track structure and threaten the running safety and ride comfort of trains. In this study, we investigate some typical statics and dynamics problems under the actual conditions of a long-span cable-stayed high-speed railway bridge with a main span of 400 m and laying ballastless track. The track-bridge finite element model and dynamic interaction model of the train-track-bridge system are first established. Furthermore, the influences of the complicated environment-induced bridge deformations are comprehensively investigated using the curvature method that reveals the deformation compatibility of the bridge-track system and indicates the dynamic interaction behavior of the train-track-bridge system subject to train running speeds and bridge deformations. Results indicate that excellent dynamic performance of the train-track-bridge system can be achieved by setting an elastic cushion of 0.1 N/mm3 under the track bed. Interface damage between track layers will not occur directly because of the complex deformations of the bridge decks. The bridge deformations induced by the environmental temperature and the concrete creep are qualified. The dynamic responses of the train-track-bridge system are also excellent under the excitations of bridge deformations. Dynamic simulations of the train-track-bridge system are proposed to evaluate long-span bridge deformations subject to complicated service situations in comparison with an oversimplified statics evaluation.

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Full-scale multi-functional test platform for investigating mechanical performance of track–subgrade systems of high-speed railways

Cited by 46 publications

References 25 publications

Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact

Simulation of Delamination Evolution of Slab Ballastless Track under Vertical Impact

Dynamic Response Characteristics of Railway Subgrade Using a Newly-Developed Prestressed Reinforcement Structure: Case Study of a Model Test

Static and dynamic effects of train-track-bridge system subject to environment-induced deformation of long-span railway bridge

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