Characterization of railway subgrade using an elastic wave full-waveform inversion method
- Authors
- Kim, Boyoung; B.; Kang, Junwon; J.W.; Choi; Y.-T.; Jang; S.Y.
- Issue Date
- 2020
- Publisher
- Korean Society for Railway
- Keywords
- Elastic waves; Full-waveform inversion (FWI) method; Lagrangian; Shear modulus; Railway subgrade; 탄성파; 전체파형 역해석; 라그랑지안; 전단탄성계수; 자갈도상
- Citation
- Journal of the Korean Society for Railway, v.23, no.4, pp.347 - 358
- Journal Title
- Journal of the Korean Society for Railway
- Volume
- 23
- Number
- 4
- Start Page
- 347
- End Page
- 358
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/12497
- DOI
- 10.7782/JKSR.2020.23.4.347
- ISSN
- 1738-6225
- Abstract
- Using field measurements of railroad responses to probing waves originating from ballast surface, this study presents a two-dimensional elastic wave full-waveform inversion (FWI) method for characterization of high-speed railway subgrade. Full-waveform inversion is implemented based on a PDE-constrained optimization approach, which seeks optimal values of elastic moduli for the domain of investigation while minimizing a Lagrangian functional. The Lagrangian consists of a least-squares objective functional and regularization terms, augmented by weak imposition of governing wave equations via Lagrange multipliers. The load data and measured surficial responses for high-speed railway subgrade are used in the FWI framework. Numerical results show that the elastic moduli of the high-speed railway subgrade can be reconstructed fairly well. Shear wave velocities of the ballast layer reconstructed by FWI method are comparable to results obtained by spectral analysis of surface waves (SASW) method. © 2020 The Korean Society for Railway.
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Collections - College of Engineering > Civil and Environmental Engineering > Journal Articles
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