Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Xue-jun, Wang; Pu, Jianghua; Wu, Peng; Chen, Mingfang

doi:10.1155/2020/9768904

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Zhang et al [23] analyzed the complex fracture phenomenon of concrete under large strain rate based on the continuous-discrete coupling method combined with CT scanning imaging technology. Wang et al [24] applied the continuous-discrete method to highspeed railway and studied the dynamic contact characteristics between track structure and ballast.…”

Section: Introductionmentioning

confidence: 99%

The Instability of High-Steep Road Cutting Slope: A 3D Continuum-Discrete Coupling Method

et al. 2022

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In this paper, the 3D continuum-discrete coupling analysis method combined with the strength reduction theory is used to study the macrodeformation, stress law, and microfracture mechanism of a high and steep cutting slope of Zhongkai Expressway in Guangdong Province. The 3D continuum-discrete coupling slope model is established based on the finite difference software FLAC and the discrete element program PFC. Then, based on the correlations between stress tensor and force chain, displacement and shear strain increment, plastic deformation, and microfracture, the mechanism of slope instability is analyzed from macro- and microscales. The research shows the following: (1) the continuum-discrete coupling model is reasonable and effective in the three-dimensional slope stability analysis. (2) The coupling domain was penetrated by the shear band, and the upper part displacement of the coupling domain was large, whose direction was basically consistent with the shear band direction; thus, the slope slip surface was formed. (3) The microfracture can represent the macroscopic failure phenomenon, and the slope landslide can be interpreted as the result of shear fracture in slip direction, accompanied by the extension and penetration of tension crack.

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Section: Introductionmentioning

confidence: 99%

The Instability of High-Steep Road Cutting Slope: A 3D Continuum-Discrete Coupling Method

et al. 2022

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Mechanical Properties of Basalt Broken Stone Ballast

Kolos

Klisch

Sobolev³

et al. 2022

Bulletin of Scientific Research Results

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Purpose: Study of strength and deformation properties of basalt broken stone ballast depending on its grain composition, the properties are necessary for further assessment of bearing capacity and deformability of railway track ballast layer. Methods: Determination of mechanical properties of broken stone ballast from basalt rock was carried out in a triaxial compression chamber which intense state close to real operating conditions was simulated. In the trial process, the dependences of axial and volumetric deformations from tension deviator were being determined. The methods of trial result statistical processing and regression analysis were used in the work. Results: According to laboratory test result statistical processing, the key characteristics of broken stone ballast strength as well as deformation modulus and Poisson’s ratio depending on the ballast grain composition were determined. Practical importance: The study results make it possible to elaborate recommendations regarding broken stone ballast grain composition, the ballast is from the basalt used in the areas of especially heavy traffic of trains.

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Investigation of conventional and asphaltic underlayment track behaviors subjected to freight train load: Mechanistic approach

Setiawan

2022

J Appl Eng Science

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The load characteristics in terms of the carrying capacity and the train operation speed limit Indonesia’s conventional track capability. In this study, the behaviors of Indonesia’s conventional tracks and the proposed asphaltic underlayment tracks under cyclic loading conditions of the low-speed Babaranjang (long-chain coal) freight trains have been evaluated using the finite element package Abaqus/CAE considering linear elastic behavior of materials. The numerical modeling was applied on three different layer thicknesses of sub-ballast in Indonesia’s conventional tracks and three different layer thicknesses of asphalt in asphaltic underlayment tracks to investigate the vertical compressive stress, horizontal-vertical-maximum strain, and deformation behaviors. According to the numerical simulation, the measurements indicate that the asphaltic underlayment tracks are superior to Indonesia’s conventional tracks. Furthermore, a 15 cm of asphalt layer in the asphaltic underlayment tracks demonstrates promising performance in the future of Indonesia’s railway systems. The asphaltic underlayment tracks are expected to serve the heavier and higher speed Babaranjang freight trains with longer service life and lower life cycle cost than Indonesia’s conventional tracks.

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Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Cited by 3 publications

References 22 publications

The Instability of High-Steep Road Cutting Slope: A 3D Continuum-Discrete Coupling Method

The Instability of High-Steep Road Cutting Slope: A 3D Continuum-Discrete Coupling Method

Mechanical Properties of Basalt Broken Stone Ballast

Investigation of conventional and asphaltic underlayment track behaviors subjected to freight train load: Mechanistic approach

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