Research Results

Characterization of Track Substructure Using Falling Weight Deflectometer and Automatic Ballast Sampling

  • 15
  • Jun
  • 2016
AUTHOR: Federal Railroad Administration
REPORT NUMBER: RR 16-16
KEYWORDS: Falling weight deflectometer, track substructure characterization, Raleigh wave
ABSTRACT: Transportation Technology Center, Inc. (TTCI) tested a falling weight deflectometer (FWD) diagnostic apparatus, which was verified using automatic ballast sampling (ABS), and examined its ability to measure track substructure characteristics by determining shear wave speed and deflection signatures for various substructure soil types and conditions.
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