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http://dx.doi.org/10.14481/jkges.2017.18.4.13

New Gain Function Based on Attenuation Characteristics of Ballast Track for GPR Analysis  

Shin, Jihoon (Korea Railroad Research Institute)
Choi, Yeongtae (Korea Railroad Research Institute)
Jang, SeungYup (Korea Railroad Research Institute)
Publication Information
Journal of the Korean GEO-environmental Society / v.18, no.4, 2017 , pp. 13-21 More about this Journal
Abstract
Ballasted track has been used as track system for more than 100 years. Ballasted track has advantages of low construction cost, flexible maintenance, low noise and vibration, and so on. However, ballasted track leads to continuous settlement which causes maintenance. Recently, increase in speed, traffic volume, and weight of train requires more frequent maintenance. Fouling, well-known phenomenon of accumulation of fine materials due to intrusion of subgrade and breakage of ballast materials, expedites the settlement (i.e., irregular settlement) of track. Ground Penetrating Radar (GPR) can be one of non-destructive tools that can evaluate fouling level of ballast. In this paper, a gain function based on the attenuation characteristics of ballast material is suggested in conjunction with Hilbert transform. Lab box tests and full-scale tests indicate that the suggested method reasonably classifies clean, fouled layers, and subgrade. However, additional study to eliminate effect of sleeper and to include the scattering features of the electromagnetic wave in ballast voids should be required in order to enhance the accuracy.
Keywords
Ballasted track; Fouling; GPR; Ballast condition; Gain compensation; Hilbert transform;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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