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- W2175283670 abstract "One parameter that greatly affects track performance and safety is the track vertical modulus, which is a measure of the vertical stiffness of the rail foundation. Ground penetrating radar (GPR) is a non-destructive and non-invasive technology that shows great potential for imaging subsurface features and assessing the integrity of track substructure. The technique is based on the principles of electromagnetic wave reflection from and transmission through distinct layers of varying dielectric properties. A single electromagnetic pulse of energy at an appropriate frequency is launched into the ground, and reflections from various subsurface layers are recorded in the form of an image. It is suggested that the information on the track substructure layering characteristics can be used to indirectly infer track modulus. A comprehensive set of coincident GPR and track modulus measurements has been acquired over various types of railroad track conditions. A multivariate linear regression analysis reveals a consistent relationship between the weighted average of subsurface 400-MHz GPR reflectivities at specific depths to the measured track modulus with an accuracy of better than approximately 3.4 MPa (500 lb/in/in). The model is thus able to predict track modulus from GPR measurements, and would considerably reduce the time and expense of operational track maintenance strategies. For the covering abstract see ITRD E122683." @default.
- W2175283670 created "2016-06-24" @default.
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- W2175283670 date "2002-01-01" @default.
- W2175283670 modified "2023-09-26" @default.
- W2175283670 title "RAILROAD TRACK MODULUS ESTIMATION USING GROUND PENETRATING RADAR (GPR) MEASUREMENTS" @default.
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