Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Identification of the Shear Velocities of Near Surface Soils Using Torsional Guided Waves

비틀림 유도파를 이용한 근지표면 전단속도 규명

  • 박경조 (전남대학교 기계자동차공학부) ;
  • 오형수 (전남대학교 기계자동차공학부)
  • Received : 2012.05.24
  • Accepted : 2012.07.05
  • Published : 2012.08.20
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Abstract

A technique is presented that uses a circular waveguide for the measurement of the bulk shear(S-wave) velocities of unconsolidated, saturated media, with particular application to near surface soils. The technique requires the measurement of the attenuation characteristics of the fumdamental T(0,1) mode that propagates along an embedded pipe, from which the acoustic properties of the surrounding medium are inferred. From the dispersion curve analysis, the feasibility of using T(0,1) mode which is non-dispersive and have constant attenuation over all frequency range is discussed. The principles behind the technique are discussed and the results of an experimental laboratory validation are presented. The experimental data are best fitted for the different depths of wetted sand and the shear velocities as a function of depths are formulated using power law curves.

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References

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  1. Sludge Detection Inside Pipes Using Torsional Guided Waves vol.23, pp.3, 2013, https://doi.org/10.5050/KSNVE.2013.23.3.282