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electromagnetic properties railway ballast research

Electromagnetic properties of railway ballast ScienceDirect

Jul 01, 2001· To investigate whether the condition of the railway ballast can be classified by the dielectric constant, ε r, — or the velocity of propagation of electromagnetic waves. 2. The suitability of the 500 or the 900 MHz GPR antennas in providing adequate penetration and of producing clear images of acceptable resolution. 3.

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Electromagnetic properties of railway ballast ScienceDirect

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 frequency antennas. Clear distinctions were obtained between wet and dry and clean and spent ballast.

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(PDF) Railway Ballast Monitoring by GPR: A Test Site

These were towed along the rail sections by means of a dedicated railway cart. Main electromagnetic parameters of railway ballast were estimated for each scenario using time- and frequency-domain

[PDF] A simulation-based approach for railway applications

In this work a numerical model capable to predict the electromagnetic response of railway ballast aggregates under different physical conditions has been calibrated and validated by a simulation-based approach. The ballast model is based on the main physical and geometrical properties of its constituent material and it is generated by means of a random-sequential absorption (RSA) approach.

(PDF) Railway Ballast Monitoring by GPR: A Test Site

ballast-sleeper a nd the wheel-rail friction filling the int er-granular air voids [4]. T his materia l can b e directly poured b y the passing freights [ 7] or it can migra te upwards or side

Railroad Ballast Evaluation Using Ground-Penetrating Radar

Ballast fouling in the railroad substructure is detrimental to the effectiveness of the railroad track and its structural capacity. The early detection of ballast fouling is of utmost importance to...

electromagnetic properties railway ballast research

A.B. Stirling, Railway Research Centre, Birmingham University, Birmingham, UK. be undertaken at the ground's surface and test the properties of all types of soils. . upper layers are stiffer than the deeper ones, as in the case of ballast overlying input signal generated by an electromagnetic vertical vibrator produces aget price

electromagnetic properties railway ballast research

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Research on Railroad Ballast Specification and Evaluation

Research on Railroad Ballast Specification and Evaluation GERALD P. RAYMOND rock, slag, and gravel railway ballast sources are summarized in this paper. Comments are included about the new Canadian Pacific Rail ballast specif i­ These two properties, texture and composition, are

Geotechnical properties of ballast and Research Online

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

Laboratory investigations for the electromagnetic

Laboratory investigations for the electromagnetic characterization of railway ballast through GPR Abstract: Ballast material typically employed in rail track bed construction has been herein physically and electromagnetically characterized. Several ground-penetrating radar (GPR) tests have been carried out in a laboratory environment, wherein a

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A Review of Methods for Estimating Ballast Degradation

Significant research has been conducted over the last two decades applying nondestructive ground-penetrating radar (GPR) measurements to evaluate the amounts of both fine-grained particles (fines) and moisture present in railway ballast. Changes to the bulk ballast electromagnetic (EM) properties in turn affect GPR wave travel times

Author: Kirk Scanlan, Michael Hendry, C. Martin, Douglas Schmitt

Railway Ballast Fouling Detection Using GPR Data

ABSTRACT Ground‐penetrating radar has been recently used for quantifying railway ballast fouling conditions. This paper discusses two approaches for processing the railway ballast ground‐penetrating radar signal: the discrete wavelet transform method and the short‐time Fourier transform method. Ground‐penetrating radar field data collected in Wyoming in 2007 by two 2‐GHz air

Cited by: 5

[PDF] ASSESSMENT OF RAILWAY TRACK SUBSTRUCTURE

Ground penetrating radar (GPR) has been employed to assess railway track substructure (ballast, subballast, and subgrade) conditions. GPR involves transmitting radar pulses into the substructure and measuring return signals that have reflected off boundaries between substructure layers with different electromagnetic properties. The principle electromagnetic property of the layers is the

Characterizing Ballast Degradation Through Los Angeles

Transportation Research Record: Journal of the Transportation Research Board, No. 2448, Transportation Research Board of the National Academies, Washington, D.C., 2014, pp. 142–151. DOI: 10.3141/2448-17 Ballast fouling, often associated with deteriorating railroad track per-formance, refers to the condition in which the ballast layer changes its

Surface wave testing for characterization of ballast and

Monitoring and identifying the changes in mechanical properties of ballast and foundation soil in a track system are essential to schedule and predict maintenance costs and to improve safety. Unlike qualitative measurements with the electromagnetic waves, for example, Ground Penetrating Radar, wave velocity measurements provide an opportunity

Research on Railroad Ballast Specification and Evaluation

Research on Railroad Ballast Specification and Evaluation GERALD P. RAYMOND rock, slag, and gravel railway ballast sources are summarized in this paper. Comments are included about the new Canadian Pacific Rail ballast specif i­ These two properties, texture and composition, are