Testing of Unknown Foundation: A Case Study with Comparison of Different NDT Methods Present at Ohio Transportation Engineering Conference Oct 23-24, 2007.

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Presentation transcript:

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, ,

Acknowledgements  Jian Fang, Josh Adams, Guoming Lin, WPC, Inc., 2201 Rowland Avenue, Savannah, GA 31404,  Bin Zhang, Case Western Reserve University

Introduction  Project Background St. Joseph hospital expansion

NDT Testing Plan After WPC Inc. Report, 2006

Impact Echo: Testing Schematic

Impact Echo: On-site Photos

Impact Echo: Examples of Analyzed Signals

Parallel Seismic Testing  Schematic Borehole SCPT

Parallel Seismic Test: Photo During Test

Parallel Seismic Testing: Ground Conditions by SCPT

Parallel Seismic Testing: Recorded Signal

Parallel Seismic Testing: After Signal Processing

Parallel Seismic Testing: Wave Train Determination

Parallel Seismic Testing: Wave Train

Parallel Seismic Testing: Wave Train Validation

Parallel Seismic: Sensitivity Analyses

Magnetometer Method: Principle

Magnetometer: Validation of Concept 1 ft Vertical motion

Magnetometer: Validation of Concept Vertical cyclic motion of rodSlow vertical motion of rod At distance of 1 ft

Magnetometer: Validation of Concept

Magnetometer Method: Recorded signal

Magnetometer: Signal Analyses for Pile Length

Design Recommendations Based on Testing Results 50 Ton

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.) Parallel Seismic Method Requires borehole Less influenced by pile integrity Requires careful signal interpretation  Wave trains  Inflection point

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

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

Thank you !