Three seismic survey techniques were tested for their ability to determine the lengths of piles and drilled shafts of bridge bents in poorly documented or undocumented foundations. The testing occurred at bridge bents along Interstate 45 southeast of downtown Houston and on half-scale foundations at the University of Houston's National Geotechnical Experimentation Site. The three methods tested were surveying the reflection of seismic waves, surveying transient forced vibrations, and a parallel seismic survey. All three methods measured the shafts or pile groups to within 0.3-1.1 m of the lengths on as-built plans. The survey of reflected seismic waves proved to be the most accurate method, while the survey of transient forced vibrations was the least accurate. However, each method's accuracy was acceptable for bridge maintenance purposes.


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  • Accession Number: 00790693
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 17 2000 12:00AM