Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Effect of Surrounding Soil Properties on the Attenuation of the First Guided Longitudinal Wave Mode Propagating in Water-filled, Buried Pipes

주변 흙의 특성이 물이 찬 매립된 배관에서 전파되는 기본 유도 종파 모드 감쇠에 미치는 영향

  • Lee, Ju-Won (Department of Ocean Engineering, Pukyong National University) ;
  • Na, Won-Bae (Department of Ocean Engineering, Pukyong National University) ;
  • Shin, Sung-Woo (Division of Safety Engineering, Pukyong National University) ;
  • Kim, Jae-Min (Department of Civil and Environmental Engineering, Chonnam National University)
  • Received : 2010.05.24
  • Accepted : 2010.08.16
  • Published : 2010.08.31
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Abstract

This study presents the attenuation characteristics of the first guided longitudinal wave mode propagating in water-filled, buried steel pipes in order to investigate the effects of soil saturation and compaction on the attenuation patterns. For numerical calculation of attenuation, 10 different combinations of S-wave velocity, P-wave velocity, and soil densities were considered. From the attenuation dispersion curves, which were obtained using Disperse software, we determined that the attenuation decreases as saturation increases, whereas it increases as compaction increases. Over the frequency range from 0.2 to 0.4 MHz, the first longitudinal wave mode has attenuations that are relatively lower than for other ranges, is faster than the first flexural wave mode, and is sensitive to defects aligned in the axial direction. Hence, the first longitudinal wave mode over the mentioned frequency range would be the proper choice for long-range buried pipelines that transport water.

Keywords

References

  1. 이주원, 신성우, 나원배, 김재민 (2010). “매립된 파이프에서 유도초음파의 종파 모드 특성”, 한국전산구조공학회 정기학술대회, pp 674-677.
  2. Adamo, F., Attivissimo, F., Fabbiano, L., Giaquinto, N. and Spadavecchia, M. (2010). “Soil Moisture Assessment by Means of Compressional and Shear Wave Velocities: Theoretical Analysis and Experimental Setup”, Measurement, Vol 43, pp 344-352. https://doi.org/10.1016/j.measurement.2009.11.007
  3. Das, B.M. (2002). Principles of Geotechnical Engineering, Brooks/Cole.
  4. Fratta, D., Alshibli, K.A., Tanner, W.M. and Roussel, L. (2005). "Combined TDR and P-Wave Velocity Measurements for the Determination of In Situ Soil Density-Experimental Study", Geotechnical Testing Journal, Vol 28, No 6, pp 1-11.
  5. Kwun, H., Kim, S.Y., Choi, M.S. and Walker, S.M. (2004). "Torsional Guided-Wave Attenuation in Coal-Tar-Enamel-Coated, Buried Piping", NDT&E International, Vol 37, pp 663-665. https://doi.org/10.1016/j.ndteint.2004.05.003
  6. Lee, J., Na, W.B., Kim, J.T. and Cho, H.M. (2008). "Mode Selection of Leaky Lamb Waves in Steel Plate”, Journal of Ocean Engineering and Technology, Vol 22, No 1, pp 6-12.
  7. Long, R., Lowe, M. and Cawley, P. (2003). "Attenuation Characteristics of the Fundamental Modes that Propagating in Buried Iron Water Pipes", Ultrasonics, Vol 41, pp 509-519. https://doi.org/10.1016/S0041-624X(03)00166-5
  8. Lu, Z., Hickey, C.J. and Sabatier, J.M. (2004). "Effects of Compaction on the Acoustic Velocity in Soils", Soil Science Society of America Journal, Vol 68, pp 7-16. https://doi.org/10.2136/sssaj2004.0007
  9. Na, W.B., Ryu, Y.S. and Kim, J.T. (2005). "Attenuation of Fundamental Longitudinal Cylindrical Guided Wave Propagating in Liquid-Filled Steel Pipes", Journal of Ocean Engineering and Technology, Vol 19, No 5, pp 26-33.