Testing of unknown foundation a case study with comparison of different ndt methods
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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, xxy21@case.edu. 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, xxy21@case.edu

Present at Ohio Transportation Engineering Conference

Oct 23-24, 2007


Acknowledgements
Acknowledgements of Different NDT Methods

  • 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 of Different NDT Methods

  • Project Background

    • St. Joseph hospital expansion


Ndt testing plan
NDT Testing Plan of Different NDT Methods

After WPC Inc. Report, 2006


Impact echo testing schematic
Impact Echo: Testing Schematic of Different NDT Methods


Impact echo on site photos
Impact Echo: On-site Photos of Different NDT Methods



Parallel seismic testing
Parallel Seismic Testing of Different NDT Methods

  • Schematic

    • Borehole

    • SCPT







Parallel seismic testing wave train
Parallel Seismic Testing: Wave Train of Different NDT Methods



Parallel seismic sensitivity analyses
Parallel Seismic: Sensitivity Analyses of Different NDT Methods


Magnetometer method principle
Magnetometer Method: Principle of Different NDT Methods


Magnetometer validation of concept

Vertical motion of Different NDT Methods

1 ft

Magnetometer: Validation of Concept


Magnetometer validation of concept1

Vertical cyclic motion of rod of Different NDT Methods

Slow vertical motion of rod

Magnetometer: Validation of Concept

At distance of 1 ft


Magnetometer validation of concept2
Magnetometer: Validation of Concept of Different NDT Methods


Magnetometer validation of concept3
Magnetometer: Validation of Concept of Different NDT Methods


Magnetometer method recorded signal
Magnetometer Method: Recorded signal of Different NDT Methods



Design recommendations based on testing results
Design Recommendations Based on Testing Results of Different NDT Methods

50 Ton


Advantages and pitfalls
Advantages and Pitfalls of Different NDT Methods

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.) of Different NDT Methods

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.) of Different NDT Methods

Magnetometer Method

  • Fast, easy

  • Requires borehole

  • Can be influenced by soil strata


Summary of experience
Summary of Experience of Different NDT Methods

  • Geophysical methods are important tools to supplement engineering decisions

  • Different testing methods can serve

    • Properly applied

    • Properly interpreted

  • Geotechnical complexity needs to be considered


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

Thank you ! of Different NDT Methods