Ground Penetrating Radar as Part of a Holistic Strategy for Inspecting Trackbed

Significant changes can occur at different stages in the lifetime of a ballasted trackbed under repeated loading. These include, but are not limited to, the generation of fines, which may clog ballast void space, the failure of the formation leading to ingress of fines through pumping and localised settlement of the formation leading to the growth of ballast pockets.

Traditional trackbed inspection strategies based on visual patrols and track geometry measurements are generally late indicators of subgrade and ballast quality-related issues. They can also be misleading, resulting in inappropriate and cost-inefficient maintenance.

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