Coupled Numerical Modelling of Railway Track Substructure with Vehicle-Track Interaction

2015 ◽  
Author(s):  
R.E. Shaltout ◽  
C. Ulianov ◽  
H.-M. Chen
Keyword(s):  
Numerical Modelling ◽  
Railway Track ◽  
Track Substructure

scholarly journals Modelling of Railway Track Temperature Regime with Real Heat-Technical Values for Different Climatic Characteristics

2017 ◽  
Vol 13 (2) ◽  
pp. 134-142 ◽  
Author(s):  
Stanislav Hodás ◽  
Alžbeta Pultznerová
Keyword(s):  
Numerical Modelling ◽  
Temperature Regime ◽  
Railway Track ◽  
High Quality ◽  
Time Operation ◽  
Negative Temperatures ◽  
Freezing Period ◽  
Long Time ◽  
Climatic Characteristics

Abstract High quality of railway track construction is a major priority. One of the quality elements is the resistance to load of railway formation with individual structural layers caused by negative temperatures during the critical freezing period of winter. Numerical modelling allows obtaining more control outputs at different climatic loads. The presented paper shows the load of railway track model with different variants of climate and shows the importance in the designing of the non-transport load under negative temperatures, i.e. observation of transition of the zero isotherm through the layers of railway subgrade. If the subgrade layers of the railway formation are built with high quality and durability then the axis of the track will keep its geometric spatial position during the long-time operation.

scholarly journals Design of ballasted railway track foundations using numerical modelling. Part II: Applications

2018 ◽  
Vol 55 (3) ◽  
pp. 369-396 ◽  
Author(s):  
Md. Abu Sayeed ◽  
Mohamed A. Shahin
Keyword(s):  
Numerical Modelling ◽  
Case Studies ◽  
Design Method ◽  
Field Measurements ◽  
Railway Track ◽  
Moving Loads ◽  
Practical Application ◽  
Field Case ◽  
Repeated Applications ◽  
Good Agreement

This paper is the second of two companion papers in relation to a new design method for ballasted railway track foundations. Development of the new design method has been explained in the first paper (i.e., Part I: Development), and the procedures for using the method and its practical application on some field case studies are presented in this paper. A special feature of the proposed design method is that it considers the true impact of train dynamic moving loads and number of repeated applications of the traffic tonnage. The proposed method is applied to four case studies of actual tracks and the results are compared with field measurements and found to be in good agreement. It should be noted that, although the proposed design method is able to overcome most shortcomings of the existing methods and found to provide excellent outcomes, further verification with more field case studies is highly desirable.

scholarly journals NUMERICAL MODELLING OF THERMAL REGIME OF RAILWAY TRACK - STRUCTURE WITH THERMAL INSULATION (STYRODUR)

2021 ◽  
Vol 27 (7) ◽  
pp. 525-538
Author(s):  
Libor Ižvolt ◽  
Peter Dobeš ◽  
Michaela Holešová ◽  
Deividas Navikas
Keyword(s):  
Numerical Modelling ◽  
Thermal Insulation ◽  
Thermal Regime ◽  
Climatic Factors ◽  
Railway Track ◽  
Track Structure ◽  
Insulation Layer ◽  
Surface Level ◽  
Main Factors ◽  
Climatic Characteristics

This paper presents the results of numerical modelling of the influence of various factors (geometrical layout of the structural layers of the railway track, climatic factors and ballast fouling) on the freezing of railway track structure with a built-in thermal insulation layer of extruded polystyrene (Styrodur). At the same time, the suitability and expediency of incorporating the thermal insulation layer at the sub-ballast upper surface level (i.e. below the rail ballast construction layer), or at the level of subgrade surface are discussed. Numerical modelling results in the main factors that should be taken into account in the dimensioning of the sub-ballast layers with a built-in thermal insulation layer. Based on the data on the depth of freezing of the railway track structure obtained from numerical modelling, a design nomogram for dimensioning was created and subsequently the influence of the changes of climatic characteristics on the freezing of the railway track structure was then mathematically expressed.

Using Time Domain Reflectometry to Determine Depth of Fouling and Fouling Type in Railway Track Substructure

2018 ◽  
Vol 42 (1) ◽  
pp. 20170305
Author(s):  
Abdullah Alsabhan ◽  
Dante Fratta ◽  
Benjamin J. Warren ◽  
James M. Tinjum ◽  
Tuncer B. Edil
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Railway Track ◽  
Track Substructure

Case study of use of falling weight deflectometer to investigate railway infrastructure constructed upon soft subgrades

2016 ◽  
Vol 53 (12) ◽  
pp. 1991-2000 ◽  
Author(s):  
Parisa Haji Abdulrazagh ◽  
Michael T. Hendry
Keyword(s):  
Dynamic Modelling ◽  
Railway Track ◽  
Falling Weight Deflectometer ◽  
Railway Infrastructure ◽  
Time Histories ◽  
Single Mass ◽  
Least Squares Curve Fitting ◽  
Track Substructure ◽  
Falling Weight

Falling weight deflectometer (FWD) testing was conducted along with embankment and subgrade sampling over 210 km (130 miles) of Canadian National Railway’s Lac La Biche Subdivision, which runs between Edmonton and Fort McMurray, as a part of a larger investigation of the line for increased axle loads. The resulting measurements were evaluated for their ability to identify soft subgrades. Two analyses were conducted to this end. First, the statistical distribution of peak deflections recorded by the FWD was investigated for different types of subgrade material. Second, the properties of track substructure were studied by characterizing the deflection time histories using a dynamic model of a single mass on a viscoelastic foundation and least-squares curve fitting. Four characteristic types of deflection time histories were identified for differing substructure conditions. Simplified dynamic modelling of railway track substructure showed that where relatively thick embankment exists over subgrade, the response of track is overdamped behavior.

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