한국지반환경공학회 논문집 (Journal of the Korean GEO-environmental Society)

한국지반환경공학회 (Korean Geo-Environmental Society)
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Analysis of Wave Propagation Characteristics in Unsaturated Clay with Emphasis on Elastic Modulus Variation

  • Weiwei Zhang (Department of Civil Engineering, INHA University) ;
  • Kiil Song (Department of Civil Engineering, INHA University)
  • 투고 : 2024.10.07
  • 심사 : 2024.10.22
  • 발행 : 2024.11.01
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초록

The propagation of elastic waves in soil is crucial in geotechnical and seismic engineering. Although soil is often assumed homogeneous, natural geomaterials like soil and rock possess inherent heterogeneity. This study uses FLAC 2D finite difference software to simulate wave propagation under different spatial variability parameters. Random field models and Monte Carlo methods were employed to generate random field data for soil parameters, reflecting the actual variability of soil. The study analyzes the effects of different correlation lengths, variability parameters, and saturation on the propagation characteristics of elastic waves, including wave velocity, amplitude attenuation, and waveform changes. Results show that wave propagation is most sensitive to elastic modulus variability, followed by porosity, while Poisson's ratio has minimal impact. Due to the variability of the elastic modulus, wave propagation time increases with increasing variability coefficient and correlation length. The peak amplitude decreases significantly, and the attenuation mean decreases while the variability of attenuation increases with increasing variability coefficient. Additionally, increasing soil saturation in heterogeneous soils leads to a decrease in wave velocity and an increase in attenuation. These findings contribute to a better understanding of elastic wave propagation in heterogeneous soils and improving design reliability.

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과제정보

This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant RS-2023-00245334).

참고문헌

  1. Cai, Y.-Q., Ding, G.-Y. and Xu, C.-J. (2009), Amplitude reduction of elastic waves by a row of piles in poroelastic soil, Computers and Geotechnics, Vol. 36, No. 3, pp. 463~473.
  2. Chammas, R., Abraham, O., Cote, P., Pedersen, H. A. and Semblat, J. F. (2003), Characterization of heterogeneous soils using surface waves: homogenization and numerical modeling, International Journal of Geomechanics, Vol. 3, No. 1, pp. 55~63.
  3. Choi, J. S., Song, K. I., Cho, G. C. and Lee, S. W. (2004), Characterization of unsaturated particulate materials using elastic and electromagnetic waves, Key Engineering Materials, Vol. 270, pp. 1653~1658.
  4. El Haber, E., Cornou, C., Jongmans, D., Abdelmassih, D. Y., Lopez-Caballero, F. and Al-Bittar, T. (2019), Influence of 2D heterogeneous elastic soil properties on surface ground motion spatial variability, Soil Dynamics and Earthquake Engineering, Vol. 123, pp. 75~90.
  5. Hall Jr, J. and Richart Jr, F. (1963), Dissipation of elastic wave energy in granular soils, Journal of the Soil Mechanics and Foundations Division, Vol. 89, No. 6, pp. 27~56.
  6. Hardin, B. O. and Richart Jr, F. (1963), Elastic wave velocities in granular soils, Journal of the Soil Mechanics and Foundations Division, Vol. 89, No. 1, pp. 33~65.
  7. Harr, M. (1987), Reliability-Based Design in Civil Engineering, McGraw-Hill Book Company, New York, N.Y.
  8. He, K. (2010), Modeling and imaging elastic waves in heterogeneous media, Ph.D. dissertation, University of Connecticut, Storrs, CT, USA.
  9. Itasca Consulting Group, Inc. (2016), FLAC 2D Version 8.0 User's Manual, Minneapolis, MN: Itasca Consulting Group, Inc.
  10. Karakul, H. and Ulusay, R. (2013), Empirical correlations for predicting strength properties of rocks from P-wave velocity under different degrees of saturation, Rock mechanics and rock engineering, Vol. 46, pp. 981~999.
  11. Kumar, M., et al. Singh, A., Kumari, M. and Barak, MS. (2021), Reflection and refraction of elastic waves at the interface of an elastic solid and partially saturated soils, Acta Mechanica, Vol. 232, No. 1, pp. 33~55.
  12. Lacasse, S. and Nadim, F. (1997), Uncertainties in characterising soil properties, Publikasjon-Norges Geotekniske Institutt, Vol. 201, pp. 49~75.
  13. Larson, G. D., Martin, J. S., Scott Jr, W. R., McCall II, G. S. and Rogers, P. H. (2002), Characterization of elastic wave propagation in soil, Detection and Remediation Technologies for Mines and Minelike Targets VII,
  14. Li, H., Zhao, M., Huang, J., Liao, W. and Ma, C. (2023), Simplified analytical solution of tunnel cross section under oblique incident SH wave in layered ground, Earthquakes and Structures, Vol. 24, No. 1, p. 65.
  15. Manolis, G. D., Shaw, R. P. and Pavlou, S. (1999), Elastic waves in nonhomogeneous media under 2D conditions: I. Fundamental solutions, Soil Dynamics and Earthquake Engineering, Vol. 18, No. 1, pp. 19~30.
  16. Santamarina, J. C., Klein, A. and Fam, M. A. (2001), Soils and waves: Particulate materials behavior, characterization and process monitoring, Journal of Soils and Sediments, Vol. 1, No. 2, pp. 130~130.
  17. Schlather, M. (2001), Simulation and analysis of random fields, R news, Vol. 1, No. 2, pp. 18~20.
  18. Shin, H.-C., Whalley, W., Attenborough, K. and Taherzadeh, S. (2016), On the theory of Brutsaert about elastic wave speeds in unsaturated soils, Soil and Tillage Research, Vol. 156, pp. 155~165.
  19. Song, K.-I. (2013), Stochastic numerical study on the propagation characteristics of P-wave in heterogeneous ground, Journal of the Korean Tunnelling and Underground Space Association, Vol. 15, No. 1, pp. 13~24.
  20. Wang, F. and Sett, K. (2016), Time-domain stochastic finite element simulation of uncertain seismic wave propagation through uncertain heterogeneous solids, Soil Dynamics and Earthquake Engineering, Vol. 88, pp. 369~385.
  21. Wang, Q., Song, E., Xu, P., He, Y., Shi, X. and Xie, H. (2023), Dynamic performance and stress wave propagation characteristics of parallel jointed rock mass using the SHPB technique, KSCE Journal of Civil Engineering, Vol. 27, No. 5, pp. 2275~2286.
  22. Yi, J.T., Zhang, L., Ye, F.J. and Goh, S.H. (2019), One-Dimensional Transient Wave Propagation in a Dry Overlying Saturated Ground, KSCE Journal of Civil Engineering, Vol. 2 3,No. 10, pp. 4297~4310.