GROUND PENETRATING RADAR EVALUATION OF RAILWAY TRACK SUBSTRUCTURE CONDITIONS

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Manuela
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GROUND PENETRATING RADAR EVALUATION OF RAILWAY TRACK SUBSTRUCTURE CONDITIONS

Mensagem por Manuela » 05 Set 2016, 11:41

Autores: G. R. Olhoeft, Ph.D, E. T. Selig, Ph.D..

ABSTRACT:
Ground penetrating radar has shown the ability to map
railroad track substructure condition on a continuous top-ofrail
nondestructive basis. In this study, 1 GHz radar data
were acquired between concrete and wood ties as well as
from the ballast shoulders beyond the ends of the ties, and
with multiple antenna orientations and polarizations.
Automatic processing of the data was developed to quickly
generate hard copy sections of radar images and for input
into railroad track performance monitoring software such as
ORIM. Substructure conditions were observed such as
thickness of the ballast and sub ballast layers, variations in
layer thickness along the track, pockets of water trapped in
the ballast, and soft subgrade from high water content. In
addition, locations and depths of subsurface drainage pipes,
trenches, and utilities were quickly and continuously
mapped. GPR data were acquired and processed from a hirail
vehicle moving continuously at 10 miles per hour with
radar resolution of a few inches horizontally and a fraction
of an inch vertically to depths of more than six feet. The
largest errors resulted from the positioning system used to
locate the antennas along and across the track. Automatic
modeling to determine density and water content is being
developed but the uneven and rough (at radar wavelengths)
air-ballast interface is a major problem in modeling the data.

Keywords: railroad, ballast, infrastructure, moisture, clay,
modeling, processing, air launched horn, derailment.
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