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

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Title: Time Domain Reflectometry for Evaluation of Simulated Sedimentation Author: yxb Last modified by: Bill Created Date: 11/11/2005 4:58:02 PM Document ... – PowerPoint PPT presentation

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


1
Testing of Unknown Foundation A Case Study with
Comparison of Different NDT Methods
Present at Ohio Transportation Engineering
Conference Oct 23-24, 2007
  • Bill X. Yu
  • Assistant Professor, Department of Civil
    Engineering, Case Western Reserve University, OH,
    USA, 216-368-6247, xxy21_at_case.edu

2
Acknowledgements
  • Jian Fang, Josh Adams, Guoming Lin, WPC, Inc.,
    2201 Rowland Avenue, Savannah, GA  31404,
    912-629-4000
  • Bin Zhang, Case Western Reserve University

3
Introduction
  • Project Background
  • St. Joseph hospital expansion

4
NDT Testing Plan
After WPC Inc. Report, 2006
5
Impact Echo Testing Schematic
6
Impact Echo On-site Photos
7
Impact Echo Examples of Analyzed Signals
8
Parallel Seismic Testing
  • Schematic
  • Borehole
  • SCPT

9
Parallel Seismic Test Photo During Test
10
Parallel Seismic Testing Ground Conditions by
SCPT
11
Parallel Seismic Testing Recorded Signal
12
Parallel Seismic Testing After Signal Processing
13
Parallel Seismic Testing Wave Train Determination
14
Parallel Seismic Testing Wave Train
15
Parallel Seismic Testing Wave Train Validation
16
Parallel Seismic Sensitivity Analyses
17
Magnetometer Method Principle
18
Magnetometer Validation of Concept
19
Magnetometer Validation of Concept
At distance of 1 ft
20
Magnetometer Validation of Concept
21
Magnetometer Validation of Concept
22
Magnetometer Method Recorded signal
23
Magnetometer Signal Analyses for Pile Length
24
Design Recommendations Based on Testing Results
50 Ton
25
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

26
Advantages and Pitfalls (cont.)
  • Parallel Seismic Method
  • Requires borehole
  • Less influenced by pile integrity
  • Requires careful signal interpretation
  • Wave trains
  • Inflection point

27
Advantages and Pitfalls (cont.)
  • Magnetometer Method
  • Fast, easy
  • Requires borehole
  • Can be influenced by soil strata

28
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

29
Thank you !
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