In the past 20 years, many studies have been performed on ballast layer inspection and condition evaluation with ground penetrating radar (GPR). GPR is a non-destructive means that can reflect the …
WhatsApp: +86 18221755073
Then, they summarized and compared processing techniques for timefrequency GPR signal that can be used to evaluate the level of railway ballast fouling. Bianchini Ciampoli et al. [10] analyzed the spectral data of GPR and assessed …
WhatsApp: +86 18221755073
The overall aim of this project was to relate ground penetrating radar (GPR) to a ballast fouling index (FI). Laboratory research aimed at characterising the electromagnetic properties has enabled ...
WhatsApp: +86 18221755073
An investigation into the railway ballast dielectric properties using different GPR antennas and frequency systems. NDT and E Int, 93 (2018), ... Electromagnetic properties of railway ballast. NDT and E Int, 34 (5) (2001), pp. 305-311. View PDF View article View in Scopus Google Scholar [49]
WhatsApp: +86 18221755073
This paper considers in detail how electromagnetic properties of trackbed materials, relating to varying degrees of ballast fouling and moisture content, affect attributes derived from reflected and scattered GPR signals. It is shown that the inherent ambiguities in the response of GPR to fouling and moisture within the trackbed mean …
WhatsApp: +86 18221755073
Functions of Sleepers: Sleepers play several crucial roles in the railroad track system: Rail Support: Sleepers provide a solid foundation for the rails, ensuring that they are securely fixed in place.; Load Distribution: Sleepers distribute the weight of the train evenly, preventing excessive pressure on the underlying ballast.; Sound and Vibration …
WhatsApp: +86 18221755073
Railway ballast is fundamental to be properly maintained [9] in view of a number of fundamental functions, such as i) resisting vertical, longitudinal and lateral …
WhatsApp: +86 18221755073
Electromagnetic properties of railway ballast. In Railway Engineering-98 Proc 1st Int Conf Brunel Univ. 1998. p. 4 In Railway Engineering-98 Proc 1st Int Conf Brunel Univ. 1998. p. 4 Powered by Pure, Scopus & Elsevier Fingerprint Engine™
WhatsApp: +86 18221755073
The properties of railway ballast material are affected by the local geologies and climatic environments from which the parent rock is sourced. These factors can make it challenging to select the most appropriate material for railway applications. To address this issue, this paper first reviews the means of ballast selection in complex ...
WhatsApp: +86 18221755073
Nevertheless, the application of GPR to assess the ballast condition is a challenging task because the material electromagnetic properties are sensitive to both the ballast grading and water content.
WhatsApp: +86 18221755073
The overall aim of this project was to relate ground penetrating radar (GPR) to a ballast fouling index (FI). Laboratory research aimed at characterising the electromagnetic …
WhatsApp: +86 18221755073
B. Robert, Non-Destructive Evaluation of Railway Trackbed Ballast, Doctor of Philosophy. The University of Edinburgh. Edinburgh UK, 2011. 5. F. K. Hamed, Evaluating the Influence of Br Aluating the Influence of Breakdown Fouling and Moistur Ouling and Moisture Content on Mechanical and Electromagnetic Properties of …
WhatsApp: +86 18221755073
Electromagnetic Properties of Railway Ballast. / Clark, M. R.; Gillespie, R.; Kemp, T. et al. In: NDT and E International: Independent Nondestructive Testing and ...
WhatsApp: +86 18221755073
This paper reports an extended study of applications of ground-penetrating radar (GPR) on the assessment of the electromagnetic (EM) properties of railway ballast. The main geometric, physical and mechanical properties of clean limestone ballast aggregates are first assessed in a laboratory environment according to relevant …
WhatsApp: +86 18221755073
We assess how these attributes vary as a function of the electromagnetic (EM) properties and the relative proportions of the constituent materials of the ballast layer. Our discussion demonstrates that moisture content and ballast fouling cannot be uniquely quantified by GPR methods alone. ... An investigation into the railway ballast ...
WhatsApp: +86 18221755073
The properties of railway ballast material are affected by the local geologies and climatic environments from which the parent rock is sourced. These factors can make it challenging to select the ...
WhatsApp: +86 18221755073
ballast deformation and degradation under different con-ditions. A flowchart of the experimental programme, conducted by the authors on railway ballast based on large-scale triaxial testing, is shown in Fig. 1. Ballast behaviour. Ballast is a free-draining granular material used as a load-bearing material in railway tracks. It is composed of ...
WhatsApp: +86 18221755073
1.1. Problems with Ballast. Although slab tracks have developed rapidly in recent decades, ballasted tracks are still the main track type for all kinds of transportation (high-speed railways, heavy-haul railways, metros, etc.) [1,2].In particular, ballasted tracks are also the main track type for general speed railways at speeds of 200–250 km/h in …
WhatsApp: +86 18221755073
Laboratory experiments were undertaken to identify and characterise the dielectric properties of railway track ballast using Ground Penetrating Radar (GPR). Better results were obtained with lower ...
WhatsApp: +86 18221755073
The 10-year old University of Edinburgh full-scale trackbed was revisited and the fouling of the ballast was recalibrated following environmental changes, using the Ionescu fouling index.
WhatsApp: +86 18221755073
You've already forked sbm 0 Code Issues Pull Requests Packages Projects Releases Wiki Activity
WhatsApp: +86 18221755073
In recent years there has been an increase in the knowledge of, and need for, non-invasive monitoring of ballast in order to identify the problematic sections of track and decrease the maintenance cost. Various technologies such as Ground Penetrating Radar (GPR) are becoming accepted for investigating the condition of ballast. However …
WhatsApp: +86 18221755073
Evaluating the Correlation Between the Geotechnical Index and the Electromagnetic Properties of Fouled Ballasted Track by a Full-Scale Laboratory Model. Hamed Faghihi Kashani ... Gillespie R., Kemp T., McCann D., and Forde M. Electromagnetic Properties of Railway Ballast. NDT and E International, Vol. 34, No. 5, 2001, pp. 305–311. Crossref.
WhatsApp: +86 18221755073
One of the current approaches to evaluating the stiffness of railway ballast is to use a falling weight deflectometer (FWD). ... the electromagnetic properties has enabled researchers worldwide to ...
WhatsApp: +86 18221755073
The 10-year old University of Edinburgh full-scale trackbed was revisited and the fouling of the ballast was recalibrated following environmental changes, using the Ionescu fouling …
WhatsApp: +86 18221755073
1. To investigate whether the condition of the railway ballast can be classified by the dielectric constant, εr, — or the velocity of propagation of electromagnetic waves. …
WhatsApp: +86 18221755073
Ballast material typically employed in rail track bed construction has been herein physically and electromagnetically characterized. Several ground-penetrating …
WhatsApp: +86 18221755073
Electromagnetic properties of railway ballast M.R. Clark, R. Gillespie, T. Kemp, D.M. McCann, M.C. Forde * School of Civil & Environmental Engineering, University of Edinburgh, The Crew Building, The Kings Buildings, Edinburgh EH9 3JN, UK Received 12 January 2000; accepted 16 January 2000 Abstract Laboratory experiments were …
WhatsApp: +86 18221755073
Ground penetrating radar (GPR) is an electromagnetic (EM) sounding technique that has been developed to aid the investigation of shallow sub-surface objects/characteristics which have contrasting electrical properties [3], [10].The application of GPR as a NDT technique within the railway industry is still essentially in its infancy in …
WhatsApp: +86 18221755073
This paper will evaluate Ground Penetrating Radar (GPR) as a Non Destructive Test (NDT) technique for the assessment of railway track bed ballast.Ballast and tracked deterioration is responsible for the majority of differential settlement of tracks, resulting in poor track geometry. Traditionally ballast is only replaced when it has …
WhatsApp: +86 18221755073