J Shanghai Jiaotong Univ Sci

Journal of shanghai Jiaotong University (Science) ›› 2013, Vol. 18 ›› Issue (6): 667-672.doi: 10.1007/s12204-013-1449-3

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Full Waveform Inversion Method for Horizontally Inhomogeneous Stratified Media

Full Waveform Inversion Method for Horizontally Inhomogeneous Stratified Media

WANG Huan (王 欢), CHE Ai-lan* (车爱兰), GE Xiu-run (葛修润)   

  1. (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  2. (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Online:2013-12-31 Published:2013-12-18
  • Contact: CHE Ai-lan (车爱兰) E-mail:alche@sjtu.edu.cn

Abstract: Full waveform inversion method is an approach to grasp the physical property parameters of underground media in geotechnical nondestructive detection and testing field. Using finite-difference time domain (FDTD) method for elastic wave equations, the full-wave field in horizontally inhomogeneous stratified media for elastic wave logging was calculated. A numerical 2D model with three layers was computed for elastic wave propagation in horizontally inhomogeneous media. The full waveform inversion method was verified to be feasible for evaluating elastic parameters in lateral inhomogeneous stratified media and showed well accuracy and convergence. It was shown that the time cost of inversion had certain dependence on the choice of starting initial model. Furthermore, this method was used in the detection of nonuniform grouting in the construction of immersed tube tunnel. The distribution of nonuniform grouting was clearly evaluated by the S-wave velocity profile of grouted mortar base below the tunnel floor.

Key words: full waveform inversion| stratified media| horizontally inhomogeneity| elastic parameter

摘要： Full waveform inversion method is an approach to grasp the physical property parameters of underground media in geotechnical nondestructive detection and testing field. Using finite-difference time domain (FDTD) method for elastic wave equations, the full-wave field in horizontally inhomogeneous stratified media for elastic wave logging was calculated. A numerical 2D model with three layers was computed for elastic wave propagation in horizontally inhomogeneous media. The full waveform inversion method was verified to be feasible for evaluating elastic parameters in lateral inhomogeneous stratified media and showed well accuracy and convergence. It was shown that the time cost of inversion had certain dependence on the choice of starting initial model. Furthermore, this method was used in the detection of nonuniform grouting in the construction of immersed tube tunnel. The distribution of nonuniform grouting was clearly evaluated by the S-wave velocity profile of grouted mortar base below the tunnel floor.

关键词: full waveform inversion| stratified media| horizontally inhomogeneity| elastic parameter

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