Testing of unknown foundation a case study with comparison of different ndt methods
This presentation is the property of its rightful owner.
Sponsored Links
1 / 29

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


  • 51 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


Impact echo testing schematic

Impact Echo: Testing Schematic


Impact echo on site photos

Impact Echo: On-site Photos


Impact echo examples of analyzed signals

Impact Echo: Examples of Analyzed Signals


Parallel seismic testing

Parallel Seismic Testing

  • Schematic

    • Borehole

    • SCPT


Parallel seismic test photo during test

Parallel Seismic Test: Photo During Test


Parallel seismic testing ground conditions by scpt

Parallel Seismic Testing: Ground Conditions by SCPT


Parallel seismic testing recorded signal

Parallel Seismic Testing: Recorded Signal


Parallel seismic testing after signal processing

Parallel Seismic Testing: After Signal Processing


Parallel seismic testing wave train determination

Parallel Seismic Testing: Wave Train Determination


Parallel seismic testing wave train

Parallel Seismic Testing: Wave Train


Parallel seismic testing wave train validation

Parallel Seismic Testing: Wave Train Validation


Parallel seismic sensitivity analyses

Parallel Seismic: Sensitivity Analyses


Magnetometer method principle

Magnetometer Method: Principle


Magnetometer validation of concept

Vertical motion

1 ft

Magnetometer: Validation of Concept


Magnetometer validation of concept1

Vertical cyclic motion of rod

Slow vertical motion of rod

Magnetometer: Validation of Concept

At distance of 1 ft


Magnetometer validation of concept2

Magnetometer: Validation of Concept


Magnetometer validation of concept3

Magnetometer: Validation of Concept


Magnetometer method recorded signal

Magnetometer Method: Recorded signal


Magnetometer signal analyses for pile length

Magnetometer: Signal Analyses for Pile Length


Design recommendations based on testing results

Design Recommendations Based on Testing Results

50 Ton


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


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

Thank you !


  • Login