This paper presents some results of a Federal Railroad Administration (FRA) sponsored research project on using seismic surface waves to evaluate track substructure (ballast and subgrade) condition and performance. The main objective of this project is to develop a system for rapidly, nondestructively, and quantitatively assessing the engineering properties of the track substructure (ballast and subgrade). These engineering properties — shear modulus, Young’s modulus, and shear strength — are derived from measurement of the shear wave velocity profile and can be used to evaluate track safety and to predict inspection and maintenance intervals. This paper describes the seismic testing, results of field measurements, and numerical modeling of the seismic wave propagation in the track substructure. Procedural issues addressed by the numerical models and presented herein include the size and location of the excitation source and orientation and spacing of the receiving accelerometers.
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2014 Joint Rail Conference
April 2–4, 2014
Colorado Springs, Colorado, USA
Conference Sponsors:
- Rail Transportation Division
ISBN:
978-0-7918-4535-6
PROCEEDINGS PAPER
Seismic Surface Wave Testing for Track Substructure Assessment
Timothy D. Stark,
Timothy D. Stark
University of Illinois at Urbana-Champaign, Urbana, IL
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Thomas J. Dehlin,
Thomas J. Dehlin
University of Illinois at Urbana-Champaign, Urbana, IL
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Soheil Nazarian,
Soheil Nazarian
University of Texas at El Paso, El Paso, TX
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Hoda Azari,
Hoda Azari
University of Texas at El Paso, El Paso, TX
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Deren Yuan,
Deren Yuan
University of Texas at El Paso, El Paso, TX
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Carlton L. Ho
Carlton L. Ho
University of Massachusetts at Amherst, Amherst, MA
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Timothy D. Stark
University of Illinois at Urbana-Champaign, Urbana, IL
Thomas J. Dehlin
University of Illinois at Urbana-Champaign, Urbana, IL
Soheil Nazarian
University of Texas at El Paso, El Paso, TX
Hoda Azari
University of Texas at El Paso, El Paso, TX
Deren Yuan
University of Texas at El Paso, El Paso, TX
Carlton L. Ho
University of Massachusetts at Amherst, Amherst, MA
Paper No:
JRC2014-3776, V001T01A017; 8 pages
Published Online:
June 3, 2014
Citation
Stark, TD, Dehlin, TJ, Nazarian, S, Azari, H, Yuan, D, & Ho, CL. "Seismic Surface Wave Testing for Track Substructure Assessment." Proceedings of the 2014 Joint Rail Conference. 2014 Joint Rail Conference. Colorado Springs, Colorado, USA. April 2–4, 2014. V001T01A017. ASME. https://doi.org/10.1115/JRC2014-3776
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