High-Precision Forward Analysis and Field Test of Boulder Detection on Zero-Offset Elastic Wave Method in Shield Tunnel
Publication: International Journal of Geomechanics
Volume 21, Issue 10
Abstract
Efficient and accurate boulder detection technology is essential for shield tunneling safely under complex floodplain geological conditions. The traditional seismic reflection method is not suitable for complex geological conditions and small targets near the surface, the elastic wave reflection method based on zero-offset observation is proposed in this article. Forward is the basis of inversion, a high-order staggered grid finite difference algorithm based on least-squares optimization (LS-SGFD) is established, which has the advantages of higher accuracy and smaller dispersion. Three typical geological models are designed, and the elastic wave reflection characteristics of the method proposed in this paper and the traditional method are systematically analyzed. From the dual perspectives of field experiment and engineering application, the effectiveness of zero-offset observation for the detection of boulders is discussed, and the basic criteria for boulder identification are given. Research shows that this method has good results in detecting boulders on the surface, and it has certain reference significance for similar projects.
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Acknowledgments
This work was financially supported by the Joint Funds of the National Natural Science Foundation of China under Grant No. U1934218, Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) under Grant No. 2019JZZY010428, and Shandong Province Transportation Technology Plan Project under Grant No. 2019B47_2. The anonymous reviewers are also deeply acknowledged for reviewing this article and giving their valuable comments.
Notation
The following symbols are used in this paper:
- cm
- FD coefficient;
- k
- wavenumber;
- Lxx
- spatial differential operators;
- Lxz
- spatial differential operators;
- Lzz
- spatial differential operators;
- Ltt
- time differential operator;
- S
- displacement field;
- t
- time;
- u
- horizontal component;
- vp
- longitudinal wave velocity;
- vs
- shear wave velocity;
- w
- vertical component;
- x
- real variable;
- Δx
- small positive value;
- ω
- angular frequency; and
- Φ0
- phase.
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Published In
International Journal of Geomechanics
Volume 21 • Issue 10 • October 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 13, 2021
Accepted: Jun 9, 2021
Published online: Aug 9, 2021
Published in print: Oct 1, 2021
Discussion open until: Jan 9, 2022
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