GPR IN THE RAIL CORRIDOR
GPR has many applications within and around the rail corridor.
Ground Penetrating Radar (GPR) is a fast and effective electromagnetic survey technique that enables the measuring of layers thickness, detection of changes on structure or on materials properties along the line. It can also detect different types of defects such as ballast pockets, fouled ballast, poor drainage, subgrade settlement and transitions problems, depending on their extension.
These defects are generally the causes of vertical deviations in track geometry and they cannot be detected by the common monitoring procedures, namely the measurements of track geometry. (Fontul et al., 2016)
In addition to track defects GPR can be used to assess heritage infrastructure surrounding the rail corridor, for example platforms or tunnels.
Due to advances in GPR development, the GPR method is in many areas around the world quickly becoming the preferred method for tunnel investigations. GPR is an easy-to-use, non-invasive, rapid and light-weight method. It can successfully detect and track fractures, both in lining and in the bedrock behind. GPR can locate risk zones, such as locating areas where lining separation and corrosion is present. GPR gives in most cases instant results at site, whereas other methods usually need more thorough and tedious evaluation.
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