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Comparison of Dispersion-Based Analysis of Surface Waves and Full Waveform Inversion in Characterizing Unknown Foundations
Over 40,000 bridges across the United States lack critical information regarding their foundation system, including their geometry, and foundation type. Nondestructive testing (NDT) and geophysical methods have gained attention over the past two decades to characterize such foundations. Despite the surge in popularity of NDT and geophysics for unknown foundations, the multichannel analysis of surface waves (MASW) method has been largely neglected for this purpose. Using a pure numerical framework, the objective of the present study is therefore to compare the effectiveness of MASW in its traditional dispersion-based approach with full waveform inversion (FWI). FWI determines high-resolution velocity models by minimizing the difference between observed and modeled seismic waveforms. In this study, numerical simulation was performed on a model representing an in-service foundation system that consists of a deep foundation system with a pile cap buried below the ground surface. Results indicated that the traditional dispersion-based MASW approach suffers from limitations when evaluating relatively small and slender anomalies embedded in the subsurface. This method cannot see the depth and extent of the buried piles nor can it provide concrete evidence regarding the existence of the pile cap. On the other hand, the FWI approach significantly outperformed traditional MASW in detecting the location and dimensions of the pile cap.
Comparison of Dispersion-Based Analysis of Surface Waves and Full Waveform Inversion in Characterizing Unknown Foundations
Over 40,000 bridges across the United States lack critical information regarding their foundation system, including their geometry, and foundation type. Nondestructive testing (NDT) and geophysical methods have gained attention over the past two decades to characterize such foundations. Despite the surge in popularity of NDT and geophysics for unknown foundations, the multichannel analysis of surface waves (MASW) method has been largely neglected for this purpose. Using a pure numerical framework, the objective of the present study is therefore to compare the effectiveness of MASW in its traditional dispersion-based approach with full waveform inversion (FWI). FWI determines high-resolution velocity models by minimizing the difference between observed and modeled seismic waveforms. In this study, numerical simulation was performed on a model representing an in-service foundation system that consists of a deep foundation system with a pile cap buried below the ground surface. Results indicated that the traditional dispersion-based MASW approach suffers from limitations when evaluating relatively small and slender anomalies embedded in the subsurface. This method cannot see the depth and extent of the buried piles nor can it provide concrete evidence regarding the existence of the pile cap. On the other hand, the FWI approach significantly outperformed traditional MASW in detecting the location and dimensions of the pile cap.
Comparison of Dispersion-Based Analysis of Surface Waves and Full Waveform Inversion in Characterizing Unknown Foundations
Mahvelati, Siavash (author) / Coe, Joseph T. (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 158-166
2019-03-21
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2019
Evaluation of Unknown Foundations Using Surface-Based Full Waveform Tomography
| British Library Online Contents | 2016
Evaluation of Unknown Foundations Using Surface-Based Full Waveform Tomography
| Online Contents | 2016