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Testing of Unknown Foundation: A Case Study with Comparison of Different NDT Methods. Bill X. Yu Assistant Professor, Department of Civil Engineering, Case Western Reserve University, OH, USA, 216-368-6247, [email protected] Present at Ohio Transportation Engineering Conference

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testing of unknown foundation a case study with comparison of different ndt methods

Testing of Unknown Foundation: A Case Study with Comparison of Different NDT Methods

Bill X. Yu

Assistant Professor, Department of Civil Engineering, Case Western Reserve University, OH, USA, 216-368-6247, [email protected]

Present at Ohio Transportation Engineering Conference

Oct 23-24, 2007

acknowledgements
Acknowledgements
  • Jian Fang, Josh Adams, Guoming Lin, WPC, Inc., 2201 Rowland Avenue, Savannah, GA  31404, 912-629-4000
  • Bin Zhang, Case Western Reserve University
introduction
Introduction
  • Project Background
    • St. Joseph hospital expansion
ndt testing plan
NDT Testing Plan

After WPC Inc. Report, 2006

parallel seismic testing
Parallel Seismic Testing
  • Schematic
    • Borehole
    • SCPT
magnetometer validation of concept1

Vertical cyclic motion of rod

Slow vertical motion of rod

Magnetometer: Validation of Concept

At distance of 1 ft

advantages and pitfalls
Advantages and Pitfalls

Impact Echo

  • Fast, easy
  • Challenge in signal interpretation
    • Influence of internal reflection (due to geometry, crack etc)
    • Signal attenuation with depth
    • Wave modes
  • Source of error: assumption of wave speed
advantages and pitfalls cont
Advantages and Pitfalls (cont.)

Parallel Seismic Method

  • Requires borehole
  • Less influenced by pile integrity
  • Requires careful signal interpretation
    • Wave trains
    • Inflection point
advantages and pitfalls cont1
Advantages and Pitfalls (cont.)

Magnetometer Method

  • Fast, easy
  • Requires borehole
  • Can be influenced by soil strata
summary of experience
Summary of Experience
  • Geophysical methods are important tools to supplement engineering decisions
  • Different testing methods can serve
    • Properly applied
    • Properly interpreted
  • Geotechnical complexity needs to be considered
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