Mapping relation between pier settlement and rail deformation of unit slab track system

Zhou, Wangbao; Nie, Leixin; Jiang, Lizhong; Feng, Yulin; Tan, Zhihua; Chai, Xilin

doi:10.1016/j.istruc.2020.07.023

Cited by 24 publications

(7 citation statements)

References 19 publications

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“…When the theoretical model is linear connect of interlayer, the gravitational acceleration is zero (assumption (f) in AM-1). The rail deflection between the track slabs and CA mortar layer can be obtained as follows [31]:…”

Section: Theoretical Model Of Linear Connect Of Interlayermentioning

confidence: 99%

“…Aiming at the mapping relationship between the lateral and vertical deformation of the simply supported bridge and the track deformation, theoretical formulae were derived and verified through experimental results and finite element analysis [28,29]. Using an efficient method of the principle of stationary potential energy, Jiang et al [30][31][32] derived the mapping expressions between the rail geometry and bridge deformations involving simply supported bridge structure and continuous bridge structure. The theoretical model considers the influence of subgrade boundary conditions on the deformation.…”

Section: Introductionmentioning

confidence: 99%

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Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer

et al. 2021

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This paper examines the effect of structural deformation on the unit slab-type ballastless track structure of high-speed railway. The principle of stationary potential energy was used to map the relation between girder vertical deformation and rail deformation considering the effect of subgrade boundary conditions and the nonlinear contact of interlayer. The theoretical model was verified by comparing with the finite element analysis and experimental results. The theoretical model was used to analyze the effects of several key parameters on the rail deformation, such as vertical deformation amplitude, elastic modulus of the mortar layer, and vertical stiffness of the fasteners. The results show that the track slabs suffered significant disengagement, which makes the deformation of the track structure at the position of the beam joint tend to be gentle when nonlinear contact between the mortar layer and the track slabs was considered. The track slabs disengagement mainly occurs near the beam joints (the side of the deformed beam). As the deflection amplitude of the girder increases, the track deformation, the fastener forces and the disengagement length of the track slabs are obviously nonlinear. When the vertical stiffness of the fastener and/or the elastic modulus of the mortar layer increase, the fastener force and the track plate disengagement length increase monotonically and nonlinearly, which will adversely affect the life and safety of the track structure.

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Section: Theoretical Model Of Linear Connect Of Interlayermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer

et al. 2021

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“…The dynamic responses of the vehicle-track system under bridge pier settlement were also analyzed. Zhou et al [17] investigated the effects of vertical deformation of the continuous beam structure of the CRTS I slab track on rail deformation based on the principle of stationary potential energy. It can be seen from the above that there are more studies on bridge pier settlement, but relatively few studies on subgrade settlement.…”

Section: Introductionmentioning

confidence: 99%

Effects of Differential Subgrade Settlement on Slab Track Deformation Based on a DEM-FDM Coupled Approach

et al. 2021

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Slab track structures become deformed under the effects of differential subgrade settlement. According to the properties of the China Railway Track System (CRTS) II slab track on a subgrade, a three-dimensional (3D) coupled model based on both the discrete element method (DEM) and finite difference method (FDM) was developed. The slab track and subgrade were simulated using the FDM and DEM, respectively. The coupled model was verified. The deformation of the slab track and contact forces of gravel grains in the surface layer of the subgrade were studied under differential subgrade settlement. The effects of settlement wavelength, settlement amplitude, and other types of settlements were also discussed. The results demonstrate that the settlement amplitude and settlement wavelength of the subgrade have significant effects on track deformation. The deformation amplitude of the slab track increases nonlinearly with an increasing settlement amplitude of the subgrade. Increases in the settlement wavelength and amplitude of the subgrade significantly increase the maximum value of the contact force of the gravel grains in the subgrade. The maximum contact force of gravel grains near the boundaries of the settlement section can reach two to three times that of the unsettled condition, which makes it easy to accelerate the plastic settlement of the subgrade.

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“…So far, a variety of researches about the mapping relationship associated with the above-mentioned objectives can be traced (He et al, 2018;Gou et al, 2018Gou et al, , 2019Gou et al, , 2021Feng et al, 2019;Zhou et al, 2020;Lai et al, 2021). In detail, He et al (2018) established a finite element model of the road-bridge transition section for the CRTS III ballastless track.…”

Section: Introductionmentioning

confidence: 99%

“…The analytical expression of the mapping relationship was obtained based on the least square method. Zhou et al (2020) obtained an analytical expression of the mapping relationship between pier settlement and the rail deformation based on a theoretical approach. Gou et al (2018Gou et al ( , 2019 established a mapping analysis model of CRTS I ballastless track based on the mechanical equilibrium equation.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Work of CRTS II Slab Ballastless Track-32m Simply Supported Girder under Pier Settlement

Zheng

Liu

et al. 2021

KSCE J Civ Eng

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Mapping relation between pier settlement and rail deformation of unit slab track system

Cited by 24 publications

References 19 publications

Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer

Mapping Relation between Rail and Bridge Deformation Considering Nonlinear Contact of Interlayer

Effects of Differential Subgrade Settlement on Slab Track Deformation Based on a DEM-FDM Coupled Approach

Cooperative Work of CRTS II Slab Ballastless Track-32m Simply Supported Girder under Pier Settlement

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