Experimental study and discrete element analysis on dynamic mechanical behaviour of railway ballast bed in windblown sand areas

2021 ◽  
Vol 304 ◽  
pp. 124669
Author(s):  
Hong Xiao ◽  
Zhihai Zhang ◽  
Yihao Chi ◽  
Meng Wang ◽  
Haoyu Wang
Keyword(s):  
Experimental Study ◽  
Mechanical Behaviour ◽  
Discrete Element ◽  
Railway Ballast ◽  
Element Analysis ◽  
Dynamic Mechanical ◽  
Windblown Sand

DEM Analysis of Lateral Ballast Resistance of Sleeper during Dynamic Stability Process under Different Vibration Frequency

2014 ◽  
Vol 988 ◽  
pp. 315-318
Author(s):  
Bo Yan ◽  
Bin Hu ◽  
Ya Yu Huang ◽  
Tao Yong Zhou
Keyword(s):  
Dynamic Stability ◽  
Vibration Frequency ◽  
Simulation Analysis ◽  
Dynamic Parameter ◽  
Discrete Element ◽  
Field Trials ◽  
Analysis Model ◽  
Railway Ballast ◽  
Element Analysis ◽  
Ballast Resistance

Railway ballast dynamic stability operations is an important work in the line maintenance and repair operations, the selection of dynamic parameter is usually dependent on field trials and practical experience, for lack of theoretical basis. This paper creates discrete element analysis model of railway ballast using the discrete element method, the numerical simulations are carried out to study the lateral ballast resistance during dynamic stability process. We focus on the influence of vibration frequency during dynamic stability process; an optimal vibration frequency of the simulation analysis is obtained and compared with the recommended vibration frequency of a product of a China Railway Large Maintenance Machinery Company, it is found that the two vibration frequencies are basically consistent. This result verifies the correct validity of the discrete element analysis model of railway ballast during dynamic stability process.

Experimental and Numerical Study of Railway Ballast Compactness during Tamping Process

2013 ◽  
Vol 690-693 ◽  
pp. 2730-2733
Author(s):  
Tao Yong Zhou ◽  
Bin Hu ◽  
Bo Yan ◽  
Jun Feng Sun
Keyword(s):  
Discrete Element Method ◽  
Numerical Study ◽  
Discrete Element ◽  
Railway Track ◽  
Analysis Model ◽  
Railway Ballast ◽  
Element Analysis ◽  
Before And After ◽  
Filling Method ◽  
Element Method

Railway ballast tamping operations is employed in order to restore the geometry of railway track distorted by train traffics. The main goal is to compact the stone ballast under the sleepers supporting the railway squeezing and vibrations. The ballast compactness is the most direct index for evaluating the effect of tamping operation. This paper presents an experimental method used to detect the railway ballast compactness before and after tamping operation based on water-filling method, and creates a discrete element analysis model of railway ballast which analyzes the change of ballast compactness before and after tamping operation based on discrete element method. The simulation results are very similar with experimental results, which verify that the discrete element method is an effective method to evaluate the change of railway ballast compactness during tamping process.

scholarly journals Discrete Element Analysis of Railway Ballast under Cycling Loading

2016 ◽  
Vol 143 ◽  
pp. 1068-1076 ◽  
Author(s):  
Enad Mahmoud ◽  
A.T. Papagiannakis ◽  
David Renteria
Keyword(s):  
Discrete Element ◽  
Railway Ballast ◽  
Element Analysis ◽  
Cycling Loading

Discrete Element Method Analysis of Mechanical Properties of Railway Ballast during Tamping Process under Different Amplitude

2012 ◽  
Vol 233 ◽  
pp. 224-227 ◽  
Author(s):  
Tao Yong Zhou ◽  
Bin Hu ◽  
Xue Jun Wang ◽  
Bo Yan
Keyword(s):  
Mechanical Properties ◽  
Discrete Element Method ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Practical Experience ◽  
Field Trials ◽  
Analysis Model ◽  
Railway Ballast ◽  
Element Analysis ◽  
Element Method

Railway ballast tamping operations is an important work in the line maintenance and repair operations, the selection of tamping parameter is usually dependent on field trials and practical experience, for the mechanical properties of railway ballast is difficult to measure and describe. This paper creates discrete element analysis model of railway ballast using the discrete element method, the numerical simulations are carried out to study the mechanical properties of railway ballast during tamping process. We focus on the influence of amplitude during tamping process; an optimal amplitude of the simulation analysis is obtained and compared with the recommended amplitude of Plasser & Theurer Company, it is found that the two amplitudes accord. This result verifies the correct validity of the discrete element analysis model of railway ballast during tamping process.

scholarly journals Discrete Element Method Simulation of Railway Ballast Compactness During Tamping Process

2013 ◽  
Vol 7 (1) ◽  
pp. 103-109 ◽  
Author(s):  
Taoyong Zhou ◽  
Bin Hu ◽  
Junfeng Sun ◽  
Zhongtian Liu
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Railway Track ◽  
Analysis Model ◽  
Railway Ballast ◽  
Simulation Data ◽  
Element Analysis ◽  
Discrete Element Method Simulation ◽  
Change Trend ◽  
Element Method

Railway ballast tamping operation is employed in order to restore the geometry of railway track distorted by train traffics. In this paper, based on analysis of tamping principle, the discrete element analysis model of railway ballast is created using the discrete element method, numerical simulations are performed to study the change of railway ballast compactness during tamping process. This paper presents the motion trend of stone ballasts as the change trend of railway ballast compactness in qualitative analysis, and the distance between stone ballast and sleeper as the change index of railway ballast compactness in quantitative analysis. By comparing simulation data of different vibration frequencies, an optimal vibration frequency is obtained. The simulation results accord with the actual industrial tamping operation, which verifies that the discrete element method is an effective method to evaluate the change of railway ballast compactness during tamping process.

Discrete Element Method Analysis of Mechanical Properties of Railway Ballast during Tamping Process under Different Vibration Frequency

2012 ◽  
Vol 190-191 ◽  
pp. 369-372
Author(s):  
Tao Yong Zhou ◽  
Bin Hu ◽  
Xue Jun Wang ◽  
Bo Yan
Keyword(s):  
Mechanical Properties ◽  
Discrete Element Method ◽  
Vibration Frequency ◽  
Simulation Analysis ◽  
Discrete Element ◽  
Field Trials ◽  
Analysis Model ◽  
Railway Ballast ◽  
Element Analysis ◽  
Element Method

Railway ballast tamping operations is an important work in the line maintenance and repair operations, the selection of tamping parameter is usually dependent on field trials and practical experience, for lack of theoretical basis. This paper creates discrete element analysis model of railway ballast using the discrete element method, the numerical simulations are carried out to study the mechanical properties of railway ballast during tamping process. We focus on the influence of vibration frequency during tamping process; an optimal vibration frequency of the simulation analysis is obtained and compared with the recommended vibration frequency of Plasser & Theurer Company, it is found that the two vibration frequencies accord. This result verifies the correct validity of the discrete element analysis model of railway ballast during tamping process.

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